diff --git a/app/(chat)/api/files/direct-upload/route.ts b/app/(chat)/api/files/direct-upload/route.ts
new file mode 100644
index 000000000..b83c19a10
--- /dev/null
+++ b/app/(chat)/api/files/direct-upload/route.ts
@@ -0,0 +1,354 @@
+import {
+  AbortMultipartUploadCommand,
+  CompleteMultipartUploadCommand,
+  CreateMultipartUploadCommand,
+  HeadObjectCommand,
+  PutObjectCommand,
+  UploadPartCommand,
+} from "@aws-sdk/client-s3";
+import { getSignedUrl } from "@aws-sdk/s3-request-presigner";
+import { NextResponse } from "next/server";
+import { z } from "zod";
+
+import { auth } from "@/app/(auth)/auth";
+import { upsertMediaAsset } from "@/lib/db/queries";
+import {
+  buildS3PublicUrl,
+  buildStorageObjectKey,
+  createS3Client,
+  getContentType,
+  maybeEnqueueStorageMigrationTask,
+  resolveS3UploadTarget,
+} from "@/lib/storage/service";
+
+const DIRECT_UPLOAD_MAX_BYTES = 500 * 1024 * 1024;
+const MULTIPART_THRESHOLD_BYTES = 50 * 1024 * 1024;
+const DEFAULT_PART_SIZE_BYTES = 8 * 1024 * 1024;
+const PRESIGNED_URL_EXPIRES_SECONDS = 15 * 60;
+const DIRECT_UPLOAD_PREFIX = "uploads/direct";
+
+const allowedDirectUploadTypes = new Set([
+  "image/jpeg",
+  "image/jpg",
+  "image/png",
+  "image/webp",
+]);
+
+const InitiateSchema = z.object({
+  action: z.literal("initiate"),
+  filename: z.string().min(1).max(256),
+  contentType: z.string().min(1).max(128),
+  size: z.number().int().positive().max(DIRECT_UPLOAD_MAX_BYTES),
+  purpose: z.string().max(64).optional(),
+});
+
+const CompleteSchema = z.object({
+  action: z.literal("complete"),
+  key: z.string().min(1).max(512),
+  uploadId: z.string().min(1).max(512).optional(),
+  filename: z.string().min(1).max(256),
+  contentType: z.string().min(1).max(128),
+  size: z.number().int().positive().max(DIRECT_UPLOAD_MAX_BYTES),
+  parts: z
+    .array(
+      z.object({
+        ETag: z.string().min(1),
+        PartNumber: z.number().int().positive(),
+      })
+    )
+    .optional(),
+  purpose: z.string().max(64).optional(),
+});
+
+const AbortSchema = z.object({
+  action: z.literal("abort"),
+  key: z.string().min(1).max(512),
+  uploadId: z.string().min(1).max(512),
+});
+
+const RequestSchema = z.discriminatedUnion("action", [
+  InitiateSchema,
+  CompleteSchema,
+  AbortSchema,
+]);
+
+function normalizeContentType(contentType: string, filename: string) {
+  const trimmed = contentType.trim().toLowerCase();
+  return trimmed || getContentType(filename);
+}
+
+function sanitizeDisplayName(filename: string) {
+  return (
+    filename
+      .trim()
+      .replace(/[^\u4e00-\u9fa5a-zA-Z0-9._-]+/g, "-")
+      .replace(/^-+|-+$/g, "")
+      .slice(0, 120) || `upload-${Date.now()}`
+  );
+}
+
+function userUploadPrefix(userId: string) {
+  return `${DIRECT_UPLOAD_PREFIX}/${userId}`;
+}
+
+function assertUserOwnedKey(key: string, userId: string) {
+  const normalized = String(key || "").replace(/^\/+/, "");
+  const prefix = `${userUploadPrefix(userId)}/`;
+  if (!normalized.startsWith(prefix)) {
+    throw new Error("Invalid upload object key");
+  }
+  return normalized;
+}
+
+function isAllowedDirectUpload(contentType: string) {
+  return allowedDirectUploadTypes.has(contentType);
+}
+
+function computePartSize(size: number) {
+  if (size <= 100 * 1024 * 1024) return DEFAULT_PART_SIZE_BYTES;
+  if (size <= 300 * 1024 * 1024) return 12 * 1024 * 1024;
+  return 16 * 1024 * 1024;
+}
+
+async function createPartUrls(params: {
+  client: ReturnType<typeof createS3Client>;
+  bucket: string;
+  key: string;
+  uploadId: string;
+  partCount: number;
+}) {
+  const urls = [];
+  for (let partNumber = 1; partNumber <= params.partCount; partNumber += 1) {
+    const command = new UploadPartCommand({
+      Bucket: params.bucket,
+      Key: params.key,
+      UploadId: params.uploadId,
+      PartNumber: partNumber,
+    });
+    urls.push({
+      partNumber,
+      url: await getSignedUrl(params.client, command, {
+        expiresIn: PRESIGNED_URL_EXPIRES_SECONDS,
+      }),
+    });
+  }
+  return urls;
+}
+
+export async function POST(request: Request) {
+  const session = await auth();
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  let payload: z.infer<typeof RequestSchema>;
+  try {
+    payload = RequestSchema.parse(await request.json());
+  } catch (error) {
+    return NextResponse.json(
+      {
+        error: "Invalid direct upload request",
+        details: error instanceof Error ? error.message : String(error),
+      },
+      { status: 400 }
+    );
+  }
+
+  const target = await resolveS3UploadTarget().catch((error) => {
+    console.error("[DirectUpload] Failed to resolve storage target:", error);
+    return null;
+  });
+
+  if (!target) {
+    return NextResponse.json(
+      { error: "Direct upload is not available for current storage backend" },
+      { status: 409 }
+    );
+  }
+
+  const client = createS3Client(target.config);
+  const bucket = target.config.bucket;
+
+  try {
+    if (payload.action === "initiate") {
+      const contentType = normalizeContentType(
+        payload.contentType,
+        payload.filename
+      );
+
+      if (!isAllowedDirectUpload(contentType)) {
+        return NextResponse.json(
+          { error: "Direct upload only supports JPG, PNG and WebP images" },
+          { status: 400 }
+        );
+      }
+
+      const displayName = sanitizeDisplayName(payload.filename);
+      const key = buildStorageObjectKey(
+        displayName,
+        userUploadPrefix(session.user.id)
+      );
+
+      if (payload.size < MULTIPART_THRESHOLD_BYTES) {
+        const command = new PutObjectCommand({
+          Bucket: bucket,
+          Key: key,
+          ContentType: contentType,
+          ACL: "public-read",
+        });
+        const url = await getSignedUrl(client, command, {
+          expiresIn: PRESIGNED_URL_EXPIRES_SECONDS,
+        });
+
+        return NextResponse.json({
+          mode: "single",
+          key,
+          url,
+          headers: {
+            "Content-Type": contentType,
+            "x-amz-acl": "public-read",
+          },
+          expiresIn: PRESIGNED_URL_EXPIRES_SECONDS,
+        });
+      }
+
+      const createResult = await client.send(
+        new CreateMultipartUploadCommand({
+          Bucket: bucket,
+          Key: key,
+          ContentType: contentType,
+          ACL: "public-read",
+        })
+      );
+
+      const uploadId = createResult.UploadId;
+      if (!uploadId) {
+        throw new Error("Storage provider did not return uploadId");
+      }
+
+      const partSize = computePartSize(payload.size);
+      const partCount = Math.ceil(payload.size / partSize);
+      const parts = await createPartUrls({
+        client,
+        bucket,
+        key,
+        uploadId,
+        partCount,
+      });
+
+      return NextResponse.json({
+        mode: "multipart",
+        key,
+        uploadId,
+        partSize,
+        partCount,
+        parts,
+        expiresIn: PRESIGNED_URL_EXPIRES_SECONDS,
+      });
+    }
+
+    if (payload.action === "abort") {
+      const key = assertUserOwnedKey(payload.key, session.user.id);
+      await client.send(
+        new AbortMultipartUploadCommand({
+          Bucket: bucket,
+          Key: key,
+          UploadId: payload.uploadId,
+        })
+      );
+      return NextResponse.json({ ok: true });
+    }
+
+    const key = assertUserOwnedKey(payload.key, session.user.id);
+    const contentType = normalizeContentType(payload.contentType, payload.filename);
+    if (!isAllowedDirectUpload(contentType)) {
+      return NextResponse.json(
+        { error: "Direct upload only supports JPG, PNG and WebP images" },
+        { status: 400 }
+      );
+    }
+
+    if (payload.uploadId) {
+      const parts = [...(payload.parts || [])].sort(
+        (a, b) => a.PartNumber - b.PartNumber
+      );
+      if (parts.length === 0) {
+        return NextResponse.json(
+          { error: "Missing multipart upload parts" },
+          { status: 400 }
+        );
+      }
+
+      await client.send(
+        new CompleteMultipartUploadCommand({
+          Bucket: bucket,
+          Key: key,
+          UploadId: payload.uploadId,
+          MultipartUpload: {
+            Parts: parts,
+          },
+        })
+      );
+    }
+
+    const head = await client.send(
+      new HeadObjectCommand({
+        Bucket: bucket,
+        Key: key,
+      })
+    );
+
+    const actualSize =
+      typeof head.ContentLength === "number" ? head.ContentLength : null;
+    if (actualSize !== null && actualSize <= 0) {
+      throw new Error("Uploaded object is empty");
+    }
+
+    const url = buildS3PublicUrl(target.config, key);
+    const resolvedContentType =
+      head.ContentType || contentType || getContentType(payload.filename);
+    const asset = await upsertMediaAsset({
+      userId: session.user.id,
+      mediaType: "image",
+      sourceType: "upload",
+      status: "ready",
+      originalUrl: url,
+      previewUrl: url,
+      thumbnailUrl: url,
+      mimeType: resolvedContentType,
+      displayName: payload.filename,
+      sourceTable: "direct_upload",
+      metadata: {
+        pathname: key,
+        size: actualSize ?? payload.size,
+        expectedSize: payload.size,
+        uploadMode: payload.uploadId ? "multipart" : "single",
+        purpose: payload.purpose || null,
+      },
+    });
+
+    await maybeEnqueueStorageMigrationTask({
+      uploaded: { url, pathname: key },
+      storageConfig: target.storageConfig,
+      migrationConfig: target.migrationConfig,
+    }).catch((error) => {
+      console.error("[DirectUpload] Failed to enqueue OSS migration task:", error);
+    });
+
+    return NextResponse.json({
+      url,
+      pathname: key,
+      contentType: resolvedContentType,
+      assetId: asset?.id ?? null,
+    });
+  } catch (error) {
+    console.error("[DirectUpload] Request failed:", error);
+    return NextResponse.json(
+      {
+        error: "Direct upload failed",
+        details: error instanceof Error ? error.message : String(error),
+      },
+      { status: 500 }
+    );
+  }
+}
diff --git a/lib/client/upload-with-retry.ts b/lib/client/upload-with-retry.ts
index 39568a79e..e351065fa 100644
--- a/lib/client/upload-with-retry.ts
+++ b/lib/client/upload-with-retry.ts
@@ -1,6 +1,10 @@
 const DEFAULT_MAX_RETRIES = 3;
 const MAX_BACKOFF_MS = 8000;
 const MAX_CONCURRENT_UPLOADS = 3;
+const DIRECT_UPLOAD_MIN_BYTES = 5 * 1024 * 1024;
+const DIRECT_UPLOAD_MAX_BYTES = 500 * 1024 * 1024;
+const DIRECT_UPLOAD_PART_CONCURRENCY = 4;
+const DIRECT_UPLOAD_SUPPRESS_MS = 2 * 60 * 1000;
 
 const RETRYABLE_UPLOAD_STATUSES = new Set([
   408,
@@ -12,8 +16,44 @@ const RETRYABLE_UPLOAD_STATUSES = new Set([
   504,
 ]);
 
+const DIRECT_UPLOAD_IMAGE_TYPES = new Set([
+  "image/jpeg",
+  "image/jpg",
+  "image/png",
+  "image/webp",
+]);
+
 let activeUploadCount = 0;
 const uploadQueue: Array<() => void> = [];
+let directUploadSuppressedUntil = 0;
+
+type UploadFormFile = {
+  blob: Blob;
+  filename: string;
+  contentType: string;
+  purpose: string;
+};
+
+type DirectUploadPart = {
+  partNumber: number;
+  url: string;
+};
+
+type DirectUploadInitiateResponse =
+  | {
+      mode: "single";
+      key: string;
+      url: string;
+      headers?: Record<string, string>;
+    }
+  | {
+      mode: "multipart";
+      key: string;
+      uploadId: string;
+      partSize: number;
+      partCount: number;
+      parts: DirectUploadPart[];
+    };
 
 function createAbortError() {
   const error = new Error("Upload aborted");
@@ -120,6 +160,263 @@ function cloneFormData(formData: FormData) {
   return copy;
 }
 
+function getUploadFormFile(formData: FormData): UploadFormFile | null {
+  const value = formData.get("file");
+  if (!(value instanceof Blob)) {
+    return null;
+  }
+
+  const filename =
+    typeof File !== "undefined" && value instanceof File && value.name
+      ? value.name
+      : `upload-${Date.now()}`;
+  const contentType = value.type || "application/octet-stream";
+  const purposeValue = formData.get("purpose");
+
+  return {
+    blob: value,
+    filename,
+    contentType,
+    purpose: typeof purposeValue === "string" ? purposeValue : "",
+  };
+}
+
+function shouldTryDirectUpload(file: UploadFormFile) {
+  if (Date.now() < directUploadSuppressedUntil) return false;
+  if (file.blob.size <= 0 || file.blob.size > DIRECT_UPLOAD_MAX_BYTES) {
+    return false;
+  }
+  if (!DIRECT_UPLOAD_IMAGE_TYPES.has(file.contentType.toLowerCase())) {
+    return false;
+  }
+  if (file.purpose === "agent-workflow-preview") {
+    return false;
+  }
+
+  return (
+    file.purpose === "canvas-upload" ||
+    file.blob.size >= DIRECT_UPLOAD_MIN_BYTES
+  );
+}
+
+function suppressDirectUploadTemporarily() {
+  directUploadSuppressedUntil = Date.now() + DIRECT_UPLOAD_SUPPRESS_MS;
+}
+
+async function readErrorPayload(response: Response) {
+  try {
+    const payload = await response.clone().json();
+    return payload?.error || payload?.details || response.statusText;
+  } catch {
+    return response.statusText;
+  }
+}
+
+async function postDirectUploadAction<T>(
+  payload: Record<string, unknown>,
+  signal?: AbortSignal
+): Promise<T> {
+  const response = await fetch("/api/files/direct-upload", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(payload),
+    signal,
+  });
+
+  if (!response.ok) {
+    throw new Error(String(await readErrorPayload(response)));
+  }
+
+  return (await response.json()) as T;
+}
+
+async function fetchDirectPartWithRetry(
+  url: string,
+  init: RequestInit,
+  maxRetries: number,
+  signal?: AbortSignal
+) {
+  for (let attempt = 0; ; attempt += 1) {
+    try {
+      const response = await fetch(url, {
+        ...init,
+        signal,
+      });
+
+      if (response.ok || !isRetryableUploadStatus(response.status) || attempt >= maxRetries) {
+        return response;
+      }
+
+      await sleep(computeBackoffMs(attempt, null), signal);
+    } catch (error) {
+      if (isAbortError(error, signal) || attempt >= maxRetries) {
+        throw error;
+      }
+
+      await sleep(computeBackoffMs(attempt, null), signal);
+    }
+  }
+}
+
+async function uploadMultipartParts(params: {
+  file: UploadFormFile;
+  upload: Extract<DirectUploadInitiateResponse, { mode: "multipart" }>;
+  maxRetries: number;
+  signal?: AbortSignal;
+}) {
+  const uploadedParts: Array<{ ETag: string; PartNumber: number }> = [];
+  let nextIndex = 0;
+
+  async function worker() {
+    for (;;) {
+      const part = params.upload.parts[nextIndex];
+      nextIndex += 1;
+      if (!part) return;
+
+      const start = (part.partNumber - 1) * params.upload.partSize;
+      const end = Math.min(start + params.upload.partSize, params.file.blob.size);
+      const body = params.file.blob.slice(start, end);
+      const response = await fetchDirectPartWithRetry(
+        part.url,
+        {
+          method: "PUT",
+          body,
+        },
+        params.maxRetries,
+        params.signal
+      );
+
+      if (!response.ok) {
+        throw new Error(`Direct multipart upload failed: ${response.status}`);
+      }
+
+      const etag = response.headers.get("ETag") || response.headers.get("etag");
+      if (!etag) {
+        throw new Error("Storage did not expose ETag; please allow ETag in bucket CORS");
+      }
+
+      uploadedParts.push({
+        ETag: etag,
+        PartNumber: part.partNumber,
+      });
+    }
+  }
+
+  await Promise.all(
+    Array.from(
+      { length: Math.min(DIRECT_UPLOAD_PART_CONCURRENCY, params.upload.parts.length) },
+      () => worker()
+    )
+  );
+
+  return uploadedParts.sort((a, b) => a.PartNumber - b.PartNumber);
+}
+
+async function fetchDirectUpload(
+  formData: FormData,
+  maxRetries: number,
+  signal?: AbortSignal
+): Promise<Response | null> {
+  const file = getUploadFormFile(formData);
+  if (!file || !shouldTryDirectUpload(file)) {
+    return null;
+  }
+
+  let multipartUpload:
+    | Extract<DirectUploadInitiateResponse, { mode: "multipart" }>
+    | null = null;
+
+  try {
+    const upload = await postDirectUploadAction<DirectUploadInitiateResponse>(
+      {
+        action: "initiate",
+        filename: file.filename,
+        contentType: file.contentType,
+        size: file.blob.size,
+        purpose: file.purpose,
+      },
+      signal
+    );
+
+    if (upload.mode === "single") {
+      const response = await fetchDirectPartWithRetry(
+        upload.url,
+        {
+          method: "PUT",
+          headers: upload.headers || {
+            "Content-Type": file.contentType,
+          },
+          body: file.blob,
+        },
+        maxRetries,
+        signal
+      );
+
+      if (!response.ok) {
+        throw new Error(`Direct upload failed: ${response.status}`);
+      }
+
+      const payload = await postDirectUploadAction<Record<string, unknown>>(
+        {
+          action: "complete",
+          key: upload.key,
+          filename: file.filename,
+          contentType: file.contentType,
+          size: file.blob.size,
+          purpose: file.purpose,
+        },
+        signal
+      );
+
+      return Response.json(payload);
+    }
+
+    multipartUpload = upload;
+    const parts = await uploadMultipartParts({
+      file,
+      upload,
+      maxRetries,
+      signal,
+    });
+    const payload = await postDirectUploadAction<Record<string, unknown>>(
+      {
+        action: "complete",
+        key: upload.key,
+        uploadId: upload.uploadId,
+        filename: file.filename,
+        contentType: file.contentType,
+        size: file.blob.size,
+        parts,
+        purpose: file.purpose,
+      },
+      signal
+    );
+
+    return Response.json(payload);
+  } catch (error) {
+    if (multipartUpload && !isAbortError(error, signal)) {
+      postDirectUploadAction(
+        {
+          action: "abort",
+          key: multipartUpload.key,
+          uploadId: multipartUpload.uploadId,
+        },
+        signal
+      ).catch(() => {});
+    }
+
+    if (!isAbortError(error, signal)) {
+      console.warn("[Upload] Direct upload failed; falling back to server upload", error);
+      suppressDirectUploadTemporarily();
+      return null;
+    }
+
+    throw error;
+  }
+}
+
 export async function fetchUploadWithRetry(
   formData: FormData,
   options?: {
@@ -130,6 +427,15 @@ export async function fetchUploadWithRetry(
   const maxRetries = options?.maxRetries ?? DEFAULT_MAX_RETRIES;
 
   return withUploadSlot(async () => {
+    const directResponse = await fetchDirectUpload(
+      formData,
+      maxRetries,
+      options?.signal
+    );
+    if (directResponse) {
+      return directResponse;
+    }
+
     for (let attempt = 0; ; attempt++) {
       try {
         const response = await fetch("/api/files/upload", {
diff --git a/lib/storage/service.ts b/lib/storage/service.ts
index f11dbfe79..2b8cd5915 100644
--- a/lib/storage/service.ts
+++ b/lib/storage/service.ts
@@ -63,7 +63,7 @@ function normalizePublicUrl(publicUrl?: string): string | undefined {
 }
 
 // 获取文件的 Content-Type
-function getContentType(filename: string): string {
+export function getContentType(filename: string): string {
   const ext = filename.toLowerCase().split(".").pop();
   const types: Record<string, string> = {
     jpg: "image/jpeg",
@@ -100,7 +100,7 @@ function getContentType(filename: string): string {
   return types[ext ?? ""] ?? "application/octet-stream";
 }
 
-function createS3Client(config: S3UploadConfig): S3Client {
+export function createS3Client(config: S3UploadConfig): S3Client {
   const normalizedEndpoint = normalizeEndpoint(config.endpoint);
   const lowerEndpoint = normalizedEndpoint.toLowerCase();
   const isCloudS3 =
@@ -118,6 +118,75 @@ function createS3Client(config: S3UploadConfig): S3Client {
   });
 }
 
+export function buildStorageObjectKey(filename: string, prefix = "uploads"): string {
+  const timestamp = Date.now();
+  const randomString = Math.random().toString(36).slice(2, 8);
+  const cleanExt = String(filename.split(".").pop() || "bin")
+    .trim()
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "")
+    .slice(0, 16) || "bin";
+  const cleanPrefix = prefix.replace(/^\/+|\/+$/g, "") || "uploads";
+  return `${cleanPrefix}/${timestamp}-${randomString}.${cleanExt}`;
+}
+
+export function buildS3PublicUrl(config: S3UploadConfig, key: string): string {
+  const normalizedEndpoint = normalizeEndpoint(config.endpoint);
+  const normalizedPublicUrl = normalizePublicUrl(config.publicUrl);
+  const cleanKey = key.replace(/^\/+/, "");
+
+  if (normalizedPublicUrl) {
+    return `${normalizedPublicUrl}/${cleanKey}`;
+  }
+
+  return `${normalizedEndpoint}/${config.bucket}/${cleanKey}`;
+}
+
+export async function resolveS3UploadTarget(): Promise<
+  | {
+      config: S3UploadConfig;
+      storageConfig?: StorageConfig;
+      migrationConfig: OssImageMigrationConfig;
+    }
+  | null
+> {
+  let migrationConfig = defaultOssImageMigrationConfig;
+  const migrationSetting = await getSystemSetting({
+    key: OSS_MIGRATION_CONFIG_KEY,
+  }).catch(() => undefined);
+  migrationConfig = normalizeOssImageMigrationConfig(migrationSetting?.value);
+
+  const selectedStorageConfig = await resolvePreferredUploadStorageConfig(
+    migrationConfig
+  );
+  const dbS3Config = toDbS3UploadConfig(selectedStorageConfig);
+  if (dbS3Config) {
+    return {
+      config: dbS3Config,
+      storageConfig: selectedStorageConfig,
+      migrationConfig,
+    };
+  }
+
+  const envS3Config = buildEnvS3Config();
+  if (envS3Config) {
+    return {
+      config: envS3Config,
+      migrationConfig,
+    };
+  }
+
+  return null;
+}
+
+export async function maybeEnqueueStorageMigrationTask(params: {
+  uploaded: { url: string; pathname: string };
+  storageConfig?: StorageConfig;
+  migrationConfig: OssImageMigrationConfig;
+}) {
+  await maybeEnqueueAliyunMigrationTask(params);
+}
+
 // S3/MinIO 上传函数（使用 AWS SDK）
 async function uploadToS3(
   filename: string,
@@ -134,10 +203,7 @@ async function uploadToS3(
   const normalizedPublicUrl = normalizePublicUrl(publicUrl);
 
   // 生成唯一的文件名
-  const timestamp = Date.now();
-  const randomString = Math.random().toString(36).slice(2, 8);
-  const ext = filename.split(".").pop();
-  const key = `uploads/${timestamp}-${randomString}.${ext}`;
+  const key = buildStorageObjectKey(filename);
 
   const contentType = getContentType(filename);
 
@@ -160,14 +226,10 @@ async function uploadToS3(
 
     // 返回文件的公开 URL
     // MinIO 的公开 URL 格式通常是: http://endpoint:port/bucket/key
-    let fileUrl: string;
-    if (normalizedPublicUrl) {
-      // 如果用户配置了自定义公开 URL，使用它
-      fileUrl = `${normalizedPublicUrl}/${key}`;
-    } else {
-      // 否则使用 endpoint + bucket + key
-      fileUrl = `${normalizedEndpoint}/${bucket}/${key}`;
-    }
+    const fileUrl = buildS3PublicUrl(
+      { ...config, endpoint: normalizedEndpoint, publicUrl: normalizedPublicUrl },
+      key
+    );
 
     console.log(`[S3 Upload] File URL: ${fileUrl}`);
 
diff --git a/package.json b/package.json
index 6f4653c5f..08e855f6d 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "@ai-sdk/react": "2.0.26",
     "@ai-sdk/xai": "2.0.13",
     "@aws-sdk/client-s3": "^3.679.0",
+    "@aws-sdk/s3-request-presigner": "^3.958.0",
     "@codemirror/lang-javascript": "^6.2.2",
     "@codemirror/lang-python": "^6.1.6",
     "@codemirror/state": "^6.5.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 907377271..87baef3c0 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -29,6 +29,9 @@ importers:
       '@aws-sdk/client-s3':
         specifier: ^3.679.0
         version: 3.958.0
+      '@aws-sdk/s3-request-presigner':
+        specifier: ^3.958.0
+        version: 3.958.0
       '@codemirror/lang-javascript':
         specifier: ^6.2.2
         version: 6.2.3
@@ -653,6 +656,10 @@ packages:
     resolution: {integrity: sha512-V8iY3blh8l2iaOqXWW88HbkY5jDoWjH56jonprG/cpyqqCnprvpMUZWPWYJoI8rHRf2bqzZeql1slxG6EnKI7A==}
     engines: {node: '>=18.0.0'}
 
+  '@aws-sdk/s3-request-presigner@3.958.0':
+    resolution: {integrity: sha512-bFKsofead/fl3lyhdES+aNo+MZ+qv1ixSPSsF8O1oj6/KgGE0t1UH9AHw2vPq6iSQMTeEuyV0F5pC+Ns40kBgA==}
+    engines: {node: '>=18.0.0'}
+
   '@aws-sdk/signature-v4-multi-region@3.957.0':
     resolution: {integrity: sha512-t6UfP1xMUigMMzHcb7vaZcjv7dA2DQkk9C/OAP1dKyrE0vb4lFGDaTApi17GN6Km9zFxJthEMUbBc7DL0hq1Bg==}
     engines: {node: '>=18.0.0'}
@@ -665,6 +672,10 @@ packages:
     resolution: {integrity: sha512-wzWC2Nrt859ABk6UCAVY/WYEbAd7FjkdrQL6m24+tfmWYDNRByTJ9uOgU/kw9zqLCAwb//CPvrJdhqjTznWXAg==}
     engines: {node: '>=18.0.0'}
 
+  '@aws-sdk/types@3.973.9':
+    resolution: {integrity: sha512-kuBfgQVdcz5Bmapc4A13YbpVw/pXkesfhetcFYwbntqas8sF41OHyd4o28+/TG2ZQdHBsv90Lsu5y6oitvYCdg==}
+    engines: {node: '>=20.0.0'}
+
   '@aws-sdk/util-arn-parser@3.957.0':
     resolution: {integrity: sha512-Aj6m+AyrhWyg8YQ4LDPg2/gIfGHCEcoQdBt5DeSFogN5k9mmJPOJ+IAmNSWmWRjpOxEy6eY813RNDI6qS97M0g==}
     engines: {node: '>=18.0.0'}
@@ -673,6 +684,10 @@ packages:
     resolution: {integrity: sha512-xwF9K24mZSxcxKS3UKQFeX/dPYkEps9wF1b+MGON7EvnbcucrJGyQyK1v1xFPn1aqXkBTFi+SZaMRx5E5YCVFw==}
     engines: {node: '>=18.0.0'}
 
+  '@aws-sdk/util-format-url@3.957.0':
+    resolution: {integrity: sha512-Yyo/tlc0iGFGTPPkuxub1uRAv6XrnVnvSNjslZh5jIYA8GZoeEFPgJa3Qdu0GUS/YwoK8GOLnnaL9h/eH5LDJQ==}
+    engines: {node: '>=18.0.0'}
+
   '@aws-sdk/util-locate-window@3.957.0':
     resolution: {integrity: sha512-nhmgKHnNV9K+i9daumaIz8JTLsIIML9PE/HUks5liyrjUzenjW/aHoc7WJ9/Td/gPZtayxFnXQSJRb/fDlBuJw==}
     engines: {node: '>=18.0.0'}
@@ -2781,6 +2796,10 @@ packages:
     resolution: {integrity: sha512-WsSHCPq/neD5G/MkK4csLI5Y5Pkd9c1NMfpYEKeghSGaD4Ja1qLIohRQf2D5c1Uy5aXp76DeKHkzWZ9KAlHroQ==}
     engines: {node: '>=18.0.0'}
 
+  '@smithy/core@3.24.4':
+    resolution: {integrity: sha512-3UNRKEyQyAgVgM0LGlerCLm+ChZWZ1GPfde+jBEW6bm6bSBGU1p0EbblaUV3unbhwvidjLA5Zs3sOs7mnZwvAw==}
+    engines: {node: '>=18.0.0'}
+
   '@smithy/credential-provider-imds@4.2.7':
     resolution: {integrity: sha512-CmduWdCiILCRNbQWFR0OcZlUPVtyE49Sr8yYL0rZQ4D/wKxiNzBNS/YHemvnbkIWj623fplgkexUd/c9CAKdoA==}
     engines: {node: '>=18.0.0'}
@@ -2893,6 +2912,10 @@ packages:
     resolution: {integrity: sha512-9oNUlqBlFZFOSdxgImA6X5GFuzE7V2H7VG/7E70cdLhidFbdtvxxt81EHgykGK5vq5D3FafH//X+Oy31j3CKOg==}
     engines: {node: '>=18.0.0'}
 
+  '@smithy/signature-v4@5.4.4':
+    resolution: {integrity: sha512-e5UtkMvsatzBfbeBZjEOt0k0Z3BEsjTFL/n6fdO5vtBLe67tdy0dX7xw2DU7uZ3acwoHyeCqpU2Fzb7pxwHb6Q==}
+    engines: {node: '>=18.0.0'}
+
   '@smithy/smithy-client@4.10.2':
     resolution: {integrity: sha512-D5z79xQWpgrGpAHb054Fn2CCTQZpog7JELbVQ6XAvXs5MNKWf28U9gzSBlJkOyMl9LA1TZEjRtwvGXfP0Sl90g==}
     engines: {node: '>=18.0.0'}
@@ -2901,6 +2924,10 @@ packages:
     resolution: {integrity: sha512-mlrmL0DRDVe3mNrjTcVcZEgkFmufITfUAPBEA+AHYiIeYyJebso/He1qLbP3PssRe22KUzLRpQSdBPbXdgZ2VA==}
     engines: {node: '>=18.0.0'}
 
+  '@smithy/types@4.14.2':
+    resolution: {integrity: sha512-P+otAxbV4CqBybp7EkcJCrig63yE2E7PuNVOmilVMRcx/O+QDzGULTrKsq4DV13gSfak9ObPrWaHl/9bL5YcWw==}
+    engines: {node: '>=18.0.0'}
+
   '@smithy/url-parser@4.2.7':
     resolution: {integrity: sha512-/RLtVsRV4uY3qPWhBDsjwahAtt3x2IsMGnP5W1b2VZIe+qgCqkLxI1UOHDZp1Q1QSOrdOR32MF3Ph2JfWT1VHg==}
     engines: {node: '>=18.0.0'}
@@ -3432,6 +3459,7 @@ packages:
   '@vercel/postgres@0.10.0':
     resolution: {integrity: sha512-fSD23DxGND40IzSkXjcFcxr53t3Tiym59Is0jSYIFpG4/0f0KO9SGtcp1sXiebvPaGe7N/tU05cH4yt2S6/IPg==}
     engines: {node: '>=18.14'}
+    deprecated: '@vercel/postgres is deprecated. If you are setting up a new database, you can choose an alternate storage solution from the Vercel Marketplace. If you had an existing Vercel Postgres database, it should have been migrated to Neon as a native Vercel integration. You can find more details and the guide to migrate to Neon''s SDKs here: https://neon.com/docs/guides/vercel-postgres-transition-guide'
 
   '@vitest/expect@3.2.4':
     resolution: {integrity: sha512-Io0yyORnB6sikFlt8QW5K7slY4OjqNX9jmJQ02QDda8lyM6B5oNgVWoSoKPac8/kgnCUzuHQKrSLtu/uOqqrig==}
@@ -6653,13 +6681,13 @@ snapshots:
   '@aws-crypto/crc32@5.2.0':
     dependencies:
       '@aws-crypto/util': 5.2.0
-      '@aws-sdk/types': 3.957.0
+      '@aws-sdk/types': 3.973.9
       tslib: 2.8.1
 
   '@aws-crypto/crc32c@5.2.0':
     dependencies:
       '@aws-crypto/util': 5.2.0
-      '@aws-sdk/types': 3.957.0
+      '@aws-sdk/types': 3.973.9
       tslib: 2.8.1
 
   '@aws-crypto/sha1-browser@5.2.0':
@@ -6693,7 +6721,7 @@ snapshots:
 
   '@aws-crypto/util@5.2.0':
     dependencies:
-      '@aws-sdk/types': 3.957.0
+      '@aws-sdk/types': 3.973.9
       '@smithy/util-utf8': 2.3.0
       tslib: 2.8.1
 
@@ -6785,7 +6813,7 @@ snapshots:
       '@smithy/node-http-handler': 4.4.7
       '@smithy/protocol-http': 5.3.7
       '@smithy/smithy-client': 4.10.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/url-parser': 4.2.7
       '@smithy/util-base64': 4.3.0
       '@smithy/util-body-length-browser': 4.2.0
@@ -6818,7 +6846,7 @@ snapshots:
 
   '@aws-sdk/crc64-nvme@3.957.0':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@aws-sdk/credential-provider-env@3.957.0':
@@ -6826,7 +6854,7 @@ snapshots:
       '@aws-sdk/core': 3.957.0
       '@aws-sdk/types': 3.957.0
       '@smithy/property-provider': 4.2.7
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@aws-sdk/credential-provider-http@3.957.0':
@@ -6838,7 +6866,7 @@ snapshots:
       '@smithy/property-provider': 4.2.7
       '@smithy/protocol-http': 5.3.7
       '@smithy/smithy-client': 4.10.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/util-stream': 4.5.8
       tslib: 2.8.1
 
@@ -6856,7 +6884,7 @@ snapshots:
       '@smithy/credential-provider-imds': 4.2.7
       '@smithy/property-provider': 4.2.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
     transitivePeerDependencies:
       - aws-crt
@@ -6869,7 +6897,7 @@ snapshots:
       '@smithy/property-provider': 4.2.7
       '@smithy/protocol-http': 5.3.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
     transitivePeerDependencies:
       - aws-crt
@@ -6897,7 +6925,7 @@ snapshots:
       '@aws-sdk/types': 3.957.0
       '@smithy/property-provider': 4.2.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@aws-sdk/credential-provider-sso@3.958.0':
@@ -6908,7 +6936,7 @@ snapshots:
       '@aws-sdk/types': 3.957.0
       '@smithy/property-provider': 4.2.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
     transitivePeerDependencies:
       - aws-crt
@@ -6920,7 +6948,7 @@ snapshots:
       '@aws-sdk/types': 3.957.0
       '@smithy/property-provider': 4.2.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
     transitivePeerDependencies:
       - aws-crt
@@ -7047,7 +7075,7 @@ snapshots:
       '@smithy/node-http-handler': 4.4.7
       '@smithy/protocol-http': 5.3.7
       '@smithy/smithy-client': 4.10.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/url-parser': 4.2.7
       '@smithy/util-base64': 4.3.0
       '@smithy/util-body-length-browser': 4.2.0
@@ -7070,13 +7098,24 @@ snapshots:
       '@smithy/types': 4.11.0
       tslib: 2.8.1
 
+  '@aws-sdk/s3-request-presigner@3.958.0':
+    dependencies:
+      '@aws-sdk/signature-v4-multi-region': 3.957.0
+      '@aws-sdk/types': 3.957.0
+      '@aws-sdk/util-format-url': 3.957.0
+      '@smithy/middleware-endpoint': 4.4.1
+      '@smithy/protocol-http': 5.3.7
+      '@smithy/smithy-client': 4.10.2
+      '@smithy/types': 4.14.2
+      tslib: 2.8.1
+
   '@aws-sdk/signature-v4-multi-region@3.957.0':
     dependencies:
       '@aws-sdk/middleware-sdk-s3': 3.957.0
       '@aws-sdk/types': 3.957.0
       '@smithy/protocol-http': 5.3.7
-      '@smithy/signature-v4': 5.3.7
-      '@smithy/types': 4.11.0
+      '@smithy/signature-v4': 5.4.4
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@aws-sdk/token-providers@3.958.0':
@@ -7086,14 +7125,19 @@ snapshots:
       '@aws-sdk/types': 3.957.0
       '@smithy/property-provider': 4.2.7
       '@smithy/shared-ini-file-loader': 4.4.2
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
     transitivePeerDependencies:
       - aws-crt
 
   '@aws-sdk/types@3.957.0':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
+      tslib: 2.8.1
+
+  '@aws-sdk/types@3.973.9':
+    dependencies:
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@aws-sdk/util-arn-parser@3.957.0':
@@ -7108,6 +7152,13 @@ snapshots:
       '@smithy/util-endpoints': 3.2.7
       tslib: 2.8.1
 
+  '@aws-sdk/util-format-url@3.957.0':
+    dependencies:
+      '@aws-sdk/types': 3.957.0
+      '@smithy/querystring-builder': 4.2.7
+      '@smithy/types': 4.14.2
+      tslib: 2.8.1
+
   '@aws-sdk/util-locate-window@3.957.0':
     dependencies:
       tslib: 2.8.1
@@ -7129,7 +7180,7 @@ snapshots:
 
   '@aws-sdk/xml-builder@3.957.0':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       fast-xml-parser: 5.2.5
       tslib: 2.8.1
 
@@ -9090,7 +9141,7 @@ snapshots:
 
   '@smithy/abort-controller@4.2.7':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@smithy/chunked-blob-reader-native@4.2.1':
@@ -9124,18 +9175,24 @@ snapshots:
       '@smithy/uuid': 1.1.0
       tslib: 2.8.1
 
+  '@smithy/core@3.24.4':
+    dependencies:
+      '@aws-crypto/crc32': 5.2.0
+      '@smithy/types': 4.14.2
+      tslib: 2.8.1
+
   '@smithy/credential-provider-imds@4.2.7':
     dependencies:
       '@smithy/node-config-provider': 4.3.7
       '@smithy/property-provider': 4.2.7
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/url-parser': 4.2.7
       tslib: 2.8.1
 
   '@smithy/eventstream-codec@4.2.7':
     dependencies:
       '@aws-crypto/crc32': 5.2.0
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/util-hex-encoding': 4.2.0
       tslib: 2.8.1
 
@@ -9159,7 +9216,7 @@ snapshots:
   '@smithy/eventstream-serde-universal@4.2.7':
     dependencies:
       '@smithy/eventstream-codec': 4.2.7
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@smithy/fetch-http-handler@5.3.8':
@@ -9266,7 +9323,7 @@ snapshots:
 
   '@smithy/property-provider@4.2.7':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@smithy/protocol-http@5.3.7':
@@ -9276,35 +9333,41 @@ snapshots:
 
   '@smithy/querystring-builder@4.2.7':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/util-uri-escape': 4.2.0
       tslib: 2.8.1
 
   '@smithy/querystring-parser@4.2.7':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@smithy/service-error-classification@4.2.7':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
 
   '@smithy/shared-ini-file-loader@4.4.2':
     dependencies:
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       tslib: 2.8.1
 
   '@smithy/signature-v4@5.3.7':
     dependencies:
       '@smithy/is-array-buffer': 4.2.0
       '@smithy/protocol-http': 5.3.7
-      '@smithy/types': 4.11.0
+      '@smithy/types': 4.14.2
       '@smithy/util-hex-encoding': 4.2.0
       '@smithy/util-middleware': 4.2.7
       '@smithy/util-uri-escape': 4.2.0
       '@smithy/util-utf8': 4.2.0
       tslib: 2.8.1
 
+  '@smithy/signature-v4@5.4.4':
+    dependencies:
+      '@smithy/core': 3.24.4
+      '@smithy/types': 4.14.2
+      tslib: 2.8.1
+
   '@smithy/smithy-client@4.10.2':
     dependencies:
       '@smithy/core': 3.20.0
@@ -9319,6 +9382,10 @@ snapshots:
     dependencies:
       tslib: 2.8.1
 
+  '@smithy/types@4.14.2':
+    dependencies:
+      tslib: 2.8.1
+
   '@smithy/url-parser@4.2.7':
     dependencies:
       '@smithy/querystring-parser': 4.2.7
diff --git a/proxy.ts b/proxy.ts
index b0ec249ce..87ad4660b 100644
--- a/proxy.ts
+++ b/proxy.ts
@@ -107,7 +107,11 @@ export async function proxy(request: NextRequest) {
         { status: 429, headers: { "Retry-After": String(retryAfter) } }
       );
     }
-  } else if (pathname === "/api/files/upload" && request.method === "POST") {
+  } else if (
+    (pathname === "/api/files/upload" ||
+      pathname === "/api/files/direct-upload") &&
+    request.method === "POST"
+  ) {
     const token = await resolveToken();
     const userId =
       typeof token?.sub === "string" && token.sub.length > 0
diff --git a/scripts/storage/configure-direct-upload-cors.ts b/scripts/storage/configure-direct-upload-cors.ts
new file mode 100644
index 000000000..37217879f
--- /dev/null
+++ b/scripts/storage/configure-direct-upload-cors.ts
@@ -0,0 +1,108 @@
+import "dotenv/config";
+
+import {
+  GetBucketCorsCommand,
+  PutBucketCorsCommand,
+  type CORSRule,
+} from "@aws-sdk/client-s3";
+
+import {
+  createS3Client,
+  resolveS3UploadTarget,
+} from "@/lib/storage/service";
+
+const DEFAULT_ORIGINS = [
+  "https://ai.yydd.ai",
+  "https://yydd.ai",
+  "https://bbyy.ai",
+  "https://goyingup.chat",
+  "http://localhost:3000",
+  "http://localhost:3001",
+];
+
+function readOrigins() {
+  const raw = process.env.DIRECT_UPLOAD_CORS_ORIGINS || "";
+  const origins = raw
+    .split(",")
+    .map((origin) => origin.trim())
+    .filter(Boolean);
+
+  return origins.length > 0 ? origins : DEFAULT_ORIGINS;
+}
+
+function normalizeRule(rule: CORSRule): CORSRule {
+  return {
+    AllowedHeaders: Array.from(new Set(rule.AllowedHeaders || [])),
+    AllowedMethods: Array.from(new Set(rule.AllowedMethods || [])),
+    AllowedOrigins: Array.from(new Set(rule.AllowedOrigins || [])),
+    ExposeHeaders: Array.from(new Set(rule.ExposeHeaders || [])),
+    MaxAgeSeconds: rule.MaxAgeSeconds,
+  };
+}
+
+function isDirectUploadRule(rule: CORSRule, origins: string[]) {
+  const methods = new Set(rule.AllowedMethods || []);
+  const allowedOrigins = new Set(rule.AllowedOrigins || []);
+  return (
+    methods.has("PUT") &&
+    methods.has("POST") &&
+    origins.some((origin) => allowedOrigins.has(origin))
+  );
+}
+
+async function main() {
+  const target = await resolveS3UploadTarget();
+  if (!target) {
+    console.log("[direct-upload-cors] skip: no S3-compatible upload target");
+    return;
+  }
+
+  const origins = readOrigins();
+  const client = createS3Client(target.config);
+  const bucket = target.config.bucket;
+  const directRule: CORSRule = {
+    AllowedOrigins: origins,
+    AllowedMethods: ["GET", "PUT", "POST", "HEAD"],
+    AllowedHeaders: ["*"],
+    ExposeHeaders: ["ETag", "x-amz-request-id", "x-amz-id-2"],
+    MaxAgeSeconds: 3600,
+  };
+
+  let existingRules: CORSRule[] = [];
+  try {
+    const current = await client.send(new GetBucketCorsCommand({ Bucket: bucket }));
+    existingRules = current.CORSRules || [];
+  } catch (error) {
+    console.warn(
+      "[direct-upload-cors] existing CORS not found or unreadable, replacing with direct upload rule:",
+      error instanceof Error ? error.message : String(error)
+    );
+  }
+
+  const mergedRules = [
+    directRule,
+    ...existingRules.filter((rule) => !isDirectUploadRule(rule, origins)),
+  ]
+    .slice(0, 100)
+    .map(normalizeRule);
+
+  await client.send(
+    new PutBucketCorsCommand({
+      Bucket: bucket,
+      CORSConfiguration: {
+        CORSRules: mergedRules,
+      },
+    })
+  );
+
+  console.log("[direct-upload-cors] configured", {
+    bucket,
+    origins,
+    ruleCount: mergedRules.length,
+  });
+}
+
+main().catch((error) => {
+  console.error("[direct-upload-cors] failed:", error);
+  process.exitCode = 1;
+});