FolderSync App and F2A

I use the FolderSync app on Android to sync my mobile data with Nextcloud.
Now I discovered that there was no connection between the app and my Nextcloud server when 2FA was activated. As I have read, you can create your own passwords for the apps under “Security” → “Devices & Sessions” to get around the problem.
However, the FolderSync app does not appear in the sessions.
My question now is whether this generally solves the problem and if so, how can I identify the app?
Thank you

You need to create a new app password. Then you use your username and this new app password for your FolderSync app. After you connected, it should then show up in the list of sessions.

I got it. The app is identified via the login. Cool! It works. Thanks.