Update app.py

correct gradio main defect

app.py

@@ -363,9 +363,10 @@ with gr.Blocks() as demo:
         chathmi2,
         title="STLA BABY - YOUR FRIENDLY GUIDE",
         description= "v0.3: Powered by MECH Core Team",
-        upload_button = gr.UploadButton("Upload File", file_count="multiple")
+        
     )
-    main.upload_button.upload(func_upload_file, [main.upload_button, main.chatbot], main.chatbot)
+    upload_button = gr.UploadButton("Upload File", file_count="multiple")
+    upload_button.upload(func_upload_file, [upload_button, main.chatbot], main.chatbot)
 
 # demo = gr.Interface(
 #     chathmi,