Thanks for the info. I will try upgrading now. To save people a click, here are the instructions:

On Syncthing on the official app, go into the settings and create a backup. Confirm you can see that backup in your files. Now stop the official app entirely using the system app settings for Syncthing (force stop the app basically - we need to ensure it’s not running). Install Syncthing-Fork v1.29.7.1 Now start Syncthing-Fork. In the Syncthing-Fork settings, restore the backup you created earlier. Like magic, everything should be as it was in Syncthing official. Confirm everything looks good. Uninstall the official Syncthing app. Delete the syncthing configuration backup from backups/syncthing. Upgrade to the latest Syncthing-Fork version