Update app.py

app.py

@@ -196,7 +196,7 @@ with gr.Blocks(gr.themes.Monochrome(), css=custom_css) as demo:
     with gr.Column():
 
         # Upload button for selecting files
-        upload_button = gr.File(file_types=["txt"], file_count="multiple")
+        upload_button = gr.File(file_types=[".txt"], file_count="multiple")
         # Button to trigger analysis
         submit_button = gr.Button("Submit")