diff --git a/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt b/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
index 9f3cc60..2f77e67 100644
--- a/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
+++ b/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
@@ -474,7 +474,8 @@ class ChatRoomsRepository @Inject constructor(
             }
 
             val totalBytes = body.contentLength()
-            val targetDirectory = context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS) ?: context.cacheDir
+            // 🎯 修正後的寫法：直接存入手機系統的公共 Download 資料夾
+            val targetDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
             val targetFile = File(targetDirectory, fileName)
             Log.d("ChatDebug", "📊 檔案總大小: $totalBytes bytes, 儲存路徑: ${targetFile.absolutePath}")