gradio text box xhange

app.py

@@ -197,7 +197,7 @@ with gr.Blocks(title="Contextual RAG Chatbot on Hugging Face Spaces") as demo:
         state=token_state,  # pass token state to the function
         multimodal=True,
         description="Upload a PDF file to start chatting!",
-        textbox=gr.MultimodalTextbox(file_types=[".pdf"])
+        textbox=gr.MultimodalTextbox(file_types=[".pdf"], show_submit=True)
     )
 
 if __name__ == "__main__":