diff --git a/lib/__tests__/public-display.test.ts b/lib/__tests__/public-display.test.ts
index 9bd955a..4559c59 100644
--- a/lib/__tests__/public-display.test.ts
+++ b/lib/__tests__/public-display.test.ts
@@ -13,13 +13,14 @@ describe('public display helpers', () => {
 
   beforeEach(() => {
     process.env.S3_PUBLIC_DOMAIN = 'https://s3.jiansun.vip/gongxiangpan'
+    delete process.env.S3_FILE_PATH
   })
 
   afterEach(() => {
     process.env = { ...originalEnv }
   })
 
-  test('应统一生成 public-display 对象路径', () => {
+  test('builds normalized public-display object paths', () => {
     expect(buildPublicDisplayObjectPath('/task-detail/material-1/main/cover.webp')).toBe(
       'public-display/task-detail/material-1/main/cover.webp',
     )
@@ -28,13 +29,21 @@ describe('public display helpers', () => {
     )
   })
 
-  test('应基于当前 S3_PUBLIC_DOMAIN 生成 public-display 公网链接', () => {
+  test('builds public-display URLs from S3_PUBLIC_DOMAIN', () => {
     expect(buildPublicDisplayUrl('task-detail/material-1/detail/detail-1.webp')).toBe(
       'https://s3.jiansun.vip/gongxiangpan/public-display/task-detail/material-1/detail/detail-1.webp',
     )
   })
 
-  test('应提供展示图常用路径构造函数', () => {
+  test('includes S3_FILE_PATH in public-display URLs when configured', () => {
+    process.env.S3_FILE_PATH = '由壹点AI/'
+
+    expect(buildPublicDisplayUrl('white-background/material-1/sku-1/front.webp')).toBe(
+      'https://s3.jiansun.vip/gongxiangpan/由壹点AI/public-display/white-background/material-1/sku-1/front.webp',
+    )
+  })
+
+  test('builds common display relative paths', () => {
     expect(buildMaterialPublicDisplayPath('preview-1.webp')).toBe('materials/preview-1.webp')
     expect(buildTaskDetailPublicDisplayPath('material-1', 'detail', 'detail-1.webp')).toBe(
       'task-detail/material-1/detail/detail-1.webp',
diff --git a/lib/__tests__/white-background-upload-route.test.ts b/lib/__tests__/white-background-upload-route.test.ts
index 531e406..19ffc71 100644
--- a/lib/__tests__/white-background-upload-route.test.ts
+++ b/lib/__tests__/white-background-upload-route.test.ts
@@ -73,6 +73,7 @@ describe('white-background upload route', () => {
     writeFile: jest.Mock
     unlink: jest.Mock
   }
+  let txMaterialUpdateMany: jest.Mock
   let consoleErrorSpy: jest.SpyInstance
 
   beforeEach(() => {
@@ -99,8 +100,12 @@ describe('white-background upload route', () => {
       skuName: 'XG014799',
     })
     ;(prisma.materialAsset.findMany as jest.Mock).mockResolvedValue([])
+    txMaterialUpdateMany = jest.fn().mockResolvedValue({ count: 1 })
     ;(prisma.$transaction as jest.Mock).mockImplementation(async (callback: any) =>
       callback({
+        material: {
+          updateMany: txMaterialUpdateMany,
+        },
         materialAsset: {
           deleteMany: jest.fn().mockResolvedValue({ count: 0 }),
           createMany: jest.fn().mockResolvedValue({ count: 1 }),
@@ -164,6 +169,17 @@ describe('white-background upload route', () => {
       Buffer.from('original-webp'),
     )
     expect(prisma.$transaction).toHaveBeenCalled()
+    expect(txMaterialUpdateMany).toHaveBeenCalledWith({
+      where: {
+        id: 'material-1',
+        previewUrl: '',
+      },
+      data: {
+        previewUrl: expect.stringMatching(
+          /^https:\/\/s3\.jiansun\.vip\/gongxiangpan\/public-display\/white-background\/material-1\/sku-1\/XG014799-.*\.webp$/,
+        ),
+      },
+    })
   })
 
   test('sourceType 缺失时应返回 400', async () => {
diff --git a/lib/public-display.ts b/lib/public-display.ts
index 0cd7423..34e3608 100644
--- a/lib/public-display.ts
+++ b/lib/public-display.ts
@@ -29,6 +29,17 @@ export function buildPublicDisplayObjectPath(relativePath: string): string {
   return `${PUBLIC_DISPLAY_PREFIX}/${normalized}`
 }
 
+function buildStorageObjectPath(objectPath: string): string {
+  const normalizedPrefix = normalizeRelativePath(process.env.S3_FILE_PATH || '')
+  const normalizedObjectPath = normalizeRelativePath(objectPath)
+
+  if (!normalizedPrefix) {
+    return normalizedObjectPath
+  }
+
+  return normalizeRelativePath(`${normalizedPrefix}/${normalizedObjectPath}`)
+}
+
 export function buildPublicDisplayUrl(relativePath: string): string | null {
   const publicDomain = normalizeS3PublicDomain()
   const objectPath = buildPublicDisplayObjectPath(relativePath)
@@ -37,7 +48,7 @@ export function buildPublicDisplayUrl(relativePath: string): string | null {
     return null
   }
 
-  return `${publicDomain}/${objectPath}`
+  return `${publicDomain}/${buildStorageObjectPath(objectPath)}`
 }
 
 export async function uploadPublicDisplayToS3(
diff --git a/lib/standard-model-white-background-service.ts b/lib/standard-model-white-background-service.ts
index 17be79f..25ac289 100644
--- a/lib/standard-model-white-background-service.ts
+++ b/lib/standard-model-white-background-service.ts
@@ -94,6 +94,16 @@ function isUsableFile(file: File | null | undefined): file is File {
   )
 }
 
+function resolvePreviewUrlFromWhiteBackgroundAsset(asset: { fileUrl?: string | null } | null | undefined): string | null {
+  const fileUrl = String(asset?.fileUrl || '').trim()
+  if (!fileUrl) {
+    return null
+  }
+
+  const publicDisplayPath = buildWhiteBackgroundPublicDisplayPathFromAssetPath(fileUrl)
+  return publicDisplayPath ? buildPublicDisplayUrl(publicDisplayPath) : fileUrl
+}
+
 function getUploadedFixedViews(fixedImages: Partial<Record<StandardModelWhiteBgKey, File | null>>) {
   return STANDARD_MODEL_WHITE_BG_VIEWS.filter((view) => isUsableFile(fixedImages[view.key]))
 }
@@ -223,6 +233,7 @@ export async function uploadStandardModelWhiteBackground(
       fileSize: bigint
       sortOrder: number
     }> = []
+    let rightFront45PreviewUrl: string | null = null
 
     for (let index = 0; index < STANDARD_MODEL_WHITE_BG_VIEWS.length; index++) {
       const view = STANDARD_MODEL_WHITE_BG_VIEWS[index]
@@ -253,6 +264,9 @@ export async function uploadStandardModelWhiteBackground(
         'image/webp',
       )
       uploadedPreviewUrls.push(previewUrl)
+      if (view.key === 'rightFront45') {
+        rightFront45PreviewUrl = previewUrl
+      }
 
       assetsToCreate.push({
         materialId: input.materialId,
@@ -313,6 +327,9 @@ export async function uploadStandardModelWhiteBackground(
       hasCompleteWhiteBackgroundAssetGroup({ fixed: nextFixed }) && nextFixedCount === STANDARD_MODEL_WHITE_BG_VIEWS.length
 
     const uploadedAt = new Date()
+    const materialPreviewUrl =
+      rightFront45PreviewUrl ||
+      resolvePreviewUrlFromWhiteBackgroundAsset(existingWhiteBackgroundGroup?.fixed.rightFront45)
 
     await prisma.$transaction(async (tx) => {
       if (assetTypeListToReplace.length > 0) {
@@ -340,6 +357,18 @@ export async function uploadStandardModelWhiteBackground(
           whiteBackgroundUploadedAt: uploadedAt,
         },
       })
+
+      if (materialPreviewUrl) {
+        await tx.material.updateMany({
+          where: {
+            id: input.materialId,
+            previewUrl: '',
+          },
+          data: {
+            previewUrl: materialPreviewUrl,
+          },
+        })
+      }
     })
     assetsPersisted = true