diff --git a/src/routes/admin/files/+page.server.ts b/src/routes/admin/files/+page.server.ts
index 0024327..d51c888 100644
--- a/src/routes/admin/files/+page.server.ts
+++ b/src/routes/admin/files/+page.server.ts
@@ -64,12 +64,15 @@ export const actions: Actions = {
 			return fail(400, { error: '没有提供有效的文件' });
 		}
 
-		// Generate unique key with year-month grouping (e.g. uploads/2026-07/timestamp-random.ext)
+		// Generate timestamp-based filename and robust physical key
 		const ext = file.name.split('.').pop() || '';
 		const randomStr = Math.random().toString(36).substring(2, 8);
 		const now = new Date();
 		const yearMonth = `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}`;
-		const key = `uploads/${yearMonth}/${Date.now()}-${randomStr}.${ext}`;
+		const yyyymmdd = `${now.getFullYear()}${String(now.getMonth() + 1).padStart(2, '0')}${String(now.getDate()).padStart(2, '0')}`;
+		const hhmmss = `${String(now.getHours()).padStart(2, '0')}${String(now.getMinutes()).padStart(2, '0')}${String(now.getSeconds()).padStart(2, '0')}`;
+		const newFilename = `${yyyymmdd}_${hhmmss}.${ext}`;
+		const key = `uploads/${yearMonth}/${yyyymmdd}_${hhmmss}_${randomStr}.${ext}`;
 
 		try {
 			// Upload to R2
@@ -81,7 +84,7 @@ export const actions: Actions = {
 			await ensureAttachmentsTable(db); // Defensive checking
 			await db.prepare(
 				'INSERT INTO attachments (filename, key, mime_type, size) VALUES (?, ?, ?, ?)'
-			).bind(file.name, key, file.type, file.size).run();
+			).bind(newFilename, key, file.type, file.size).run();
 
 			return { success: true };
 		} catch (err: any) {