try to fix upload bug

app.py

@@ -26,9 +26,11 @@ st.write('## Generate metadata?')
 uploaded_file = st.file_uploader("Choose a PDF file", type=["pdf","txt"])
 
 if uploaded_file is not None:
-    with tempfile.NamedTemporaryFile(delete=False, suffix=os.path.splitext(uploaded_file.name)[1]) as tmp:
+    extension = uploaded_file.name.split('.')[-1]
+
+    with tempfile.NamedTemporaryFile(delete=False) as tmp:
         tmp.write(uploaded_file.read())
-        file_path = tmp.name
+        file_path = f'{tmp.name}.{extension}'
         st.write(f'Created temporary file {file_path}')
 
     docs = ingest(file_path)