You can configure options in this file `/var/www/tube/config.json` using the [documentation](https://git.mills.io/prologic/tube#configuration). Remember to restart Tube service if you change your configuration file.
The data directory with uploaded videos is untouched when upgrading the app. If you want to delete the data directory with the application, use the `--purge` option: `sudo yunohost app remove tube --purge`