Update app.py

app.py

@@ -66,6 +66,8 @@ with st.sidebar:
     )
     progress_text = st.empty()
     progress_bar = st.progress(0)
+    # Placeholder for the download button so it persists.
+    download_placeholder = st.empty()
 
 ###############################################################################
 # MAIN TITLE
@@ -225,7 +227,7 @@ if example_option == "None" and source_file and source_file.type.split('/')[0] !
 # Always display the download button if a processed video is ready.
 ###############################################################################
 if st.session_state["shortened_video_ready"] and st.session_state["shortened_video_data"]:
-    st.download_button(
+    download_placeholder.download_button(
         label="Download Processed Video",
         data=st.session_state["shortened_video_data"],
         file_name="processed_video.mp4",