add label for pdf input

app.py

@@ -26,6 +26,6 @@ def answer_doc_question(pdf_file, question):
     return answer["answer"]
 
 
-pdf_input = gr.File(file_types=[".pdf"])
+pdf_input = gr.File(file_types=[".pdf"], label="Upload a PDF document and ask a question about it.")
 question = gr.Textbox(label="Type a question regarding the uploaded document here.")
 gr.Interface(fn=answer_doc_question, inputs=[pdf_input, question], outputs="text").launch()