Update src/app.py

src/app.py

@@ -65,10 +65,10 @@ process = st.sidebar.button("Submit")
 #         st.warning("Please upload a PDF file.")
 
 if process:
-    if uploaded_file is not None and isinstance(uploaded_file, list) and len(uploaded_file) > 0:
+    if uploaded_file is not None:
         process_pdf(uploaded_file)
     else:
-        st.warning("Please upload at least one PDF file.")
+        st.warning("Please upload a PDF file.")
         
         
 if input_method == "Choose input method...":