Update app.py

app.py

@@ -120,7 +120,7 @@ with gr.Blocks() as demo:
     gr.Markdown(about_bot)
     with gr.Row():
         with gr.Column():
-            files = gr.Files(label = "Upload PDF Files")
+            files = gr.Files(label = "Upload PDF Files", file_types = ['.pdf'])
             user_input = gr.Textbox(label = "Enter Query")
         with gr.Column():
             output = gr.Textbox(label = "Chatbot Response")