Update app.py

app.py

@@ -33,15 +33,15 @@ def infer(question):
 
 with gr.Blocks() as demo:
     with gr.Column():
-        pdf_doc = gr.File(label="Load a pdf")
+        pdf_doc = gr.File(label="Load a pdf", file_types=['.pdf'], type="file")
         langchain_status = gr.Textbox()
-        
+        load_pdf = gr.Button("Load pdf to langchain")
         question = gr.Textbox(label="Your Question")
         answer = gr.Textbox(label="Anwser")
         
         submit_button = gr.Button("Send Question")
     
-    pdf_doc.change(pdf_changes, pdf_doc, langchain_status, queue=False)
+    load_pdf.click(pdf_changes, pdf_doc, langchain_status, queue=False)
     submit_button.click(infer, inputs=[question], outputs=[answer])