add function: upload and parse (#1889)

### What problem does this PR solve?

#1880
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/conversation_app.py

@@ -118,6 +118,8 @@ def completion():
         if m["role"] == "assistant" and not msg:
             continue
         msg.append({"role": m["role"], "content": m["content"]})
+        if "doc_ids" in m:
+            msg[-1]["doc_ids"] = m["doc_ids"]
     try:
         e, conv = ConversationService.get_by_id(req["conversation_id"])
         if not e: