Update app.py

app.py

@@ -96,7 +96,7 @@ with gr.Blocks(css=css) as demo:
         
         with gr.Column():
             openai_key = gr.Textbox(label="You OpenAI API key", type="password")
-            pdf_doc = gr.File(label="Load a pdf", file_count="multiple", file_types=['.pdf'], type="file")
+            pdf_doc = gr.File(label="Load a pdf", file_types=['.pdf'], type="file")
             with gr.Row():
                 langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False)
                 load_pdf = gr.Button("Load pdf to langchain")