diff --git a/nanobot/channels/feishu.py b/nanobot/channels/feishu.py
index d450e25..695689e 100644
--- a/nanobot/channels/feishu.py
+++ b/nanobot/channels/feishu.py
@@ -985,10 +985,13 @@ class FeishuChannel(BaseChannel):
                 else:
                     key = await loop.run_in_executor(None, self._upload_file_sync, file_path)
                     if key:
-                        # Use msg_type "media" for audio/video so users can play inline;
-                        # "file" for everything else (documents, archives, etc.)
-                        if ext in self._AUDIO_EXTS or ext in self._VIDEO_EXTS:
-                            media_type = "media"
+                        # Use msg_type "audio" for audio, "video" for video, "file" for documents.
+                        # Feishu requires these specific msg_types for inline playback.
+                        # Note: "media" is only valid as a tag inside "post" messages, not as a standalone msg_type.
+                        if ext in self._AUDIO_EXTS:
+                            media_type = "audio"
+                        elif ext in self._VIDEO_EXTS:
+                            media_type = "video"
                         else:
                             media_type = "file"
                         await loop.run_in_executor(