diff --git a/backend/app/channels/feishu.py b/backend/app/channels/feishu.py
index 9ba97e233c..ee2e14fd7d 100644
--- a/backend/app/channels/feishu.py
+++ b/backend/app/channels/feishu.py
@@ -733,6 +733,9 @@ class FeishuChannel(Channel):
                 virtual_path = await self._receive_single_file(msg.thread_ts, file["file_key"], "file", thread_id, user_id=user_id)
                 replace_next_placeholder("[file]", virtual_path)
         msg.text = text
+        # Clear the descriptors so the generic URL-based _ingest_inbound_files
+        # pass does not try to re-fetch files that were downloaded by key.
+        msg.files = []
         return msg
 
     async def _receive_single_file(
diff --git a/backend/tests/test_feishu_parser.py b/backend/tests/test_feishu_parser.py
index 333c5cb35e..2b6188eb63 100644
--- a/backend/tests/test_feishu_parser.py
+++ b/backend/tests/test_feishu_parser.py
@@ -513,6 +513,7 @@ def test_feishu_receive_file_replaces_placeholders_in_order():
         result = await channel.receive_file(msg, "thread_1")
 
         assert result.text == "before /mnt/user-data/uploads/a.png middle /mnt/user-data/uploads/b.pdf after"
+        assert result.files == []
 
     _run(go())