update UI

app.py

@@ -16,11 +16,11 @@ st.title('Paper2Slides')
 
 st.subheader('Upload paper in pdf format')
 uploaded_file = st.file_uploader("Choose a file")
-
-if uploaded_file is not None:
-    option = st.selectbox(
+option = st.selectbox(
         'Please select one of the parsing method.',
         ('monkey', 'x2d', 'lxml'))
+
+if uploaded_file is not None:
     
     st.write(uploaded_file.name)
     bytes_data = uploaded_file.getvalue()