fix the error of unable to retrieve url from file (#13603)

api/core/file/file_manager.py

         case FileAttribute.TRANSFER_METHOD:
             return file.transfer_method.value
         case FileAttribute.URL:
-            return file.remote_url
+            return _to_url(file)
         case FileAttribute.EXTENSION:
             return file.extension
         case FileAttribute.RELATED_ID: