allow only pdf files

app.py

@@ -134,7 +134,7 @@ for i in st.session_state["chat_history"]:
 # pinecone.init(api_key=PINECONE_API_KEY, environment=PINECONE_ENV)
 # st.text(pinecone)
 
-uploaded_files = st.file_uploader("Choose a CSV file", accept_multiple_files=True)
+uploaded_files = st.file_uploader('Choose your .pdf file', type="pdf", accept_multiple_files=True)
 for uploaded_file in uploaded_files:
     bytes_data = uploaded_file.read()
     st.write("filename:", uploaded_file.name)