Try Seat Upgrade in Train App After Boarding

Four moves for Try Seat Upgrade in Train App After Boarding that actually stick in Chengdu:

1. Stop researching after two tabs; you are procrastinating.
2. Keep a photo of the 'done correctly' version in your album.
3. Do it on a calm day, not the day everything else breaks.
4. Test the backup version once; hope you never need it.

The list is short on purpose. Long lists become wallpaper.