diff --git a/lib/openclaw-chat/media-attachments.ts b/lib/openclaw-chat/media-attachments.ts
index a2b13c3dc..fa17b41f8 100644
--- a/lib/openclaw-chat/media-attachments.ts
+++ b/lib/openclaw-chat/media-attachments.ts
@@ -27,6 +27,27 @@ const VIDEO_CONTENT_TYPE_BY_EXTENSION: Record<string, string> = {
 
 const VIDEO_EXTENSION_PATTERN = /\.(mp4|mov|webm|m4v|mkv)(?:$|[?#])/i;
 const ARCHIVE_EXTENSION_PATTERN = /\.zip(?:$|[?#])/i;
+const FILE_EXTENSION_PATTERN =
+  /\.(zip|rar|7z|tar|gz|tgz|pdf|txt|md|docx?|pptx?|xlsx?|csv|tsv|json|xml|mp3|wav|m4a|aac|flac|ogg|psd|ai|dxf|dwg|step|stp)(?:$|[?#])/i;
+const FILE_CONTENT_TYPES = new Set([
+  "application/gzip",
+  "application/msword",
+  "application/pdf",
+  "application/vnd.ms-excel",
+  "application/vnd.ms-powerpoint",
+  "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+  "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+  "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+  "application/vnd.rar",
+  "application/x-7z-compressed",
+  "application/x-rar-compressed",
+  "application/x-tar",
+  "application/x-zip-compressed",
+  "application/zip",
+  "text/csv",
+  "text/plain",
+  "text/tab-separated-values",
+]);
 
 export type OpenClawChatMediaAttachment = {
   type: "image" | "video" | "file";
@@ -105,6 +126,18 @@ export function isOpenClawChatArchiveAttachment(
   );
 }
 
+export function isOpenClawChatFileAttachment(
+  url: string,
+  contentType?: string | null
+) {
+  const normalizedContentType = normalizeContentType(contentType);
+  return (
+    FILE_CONTENT_TYPES.has(normalizedContentType) ||
+    normalizedContentType.startsWith("audio/") ||
+    FILE_EXTENSION_PATTERN.test(String(url || ""))
+  );
+}
+
 export function normalizeOpenClawChatMediaAttachments(
   value: unknown
 ): OpenClawChatMediaAttachment[] {