How do I sync watched movies and shows from Jellyfin to Watcharr?

[dannyyy]

I thought, I could use Watcharr to automatically track my watched movies and shows. But this doesn't seems to be the case.

My setup, Watcharr with configured Jellyfin URL and my Watcharr profile is the same user than my Jellyfin use. Being in the user profile, I have at the bottom of the page a button Sync with Jellyfin. After clicking it, it seems that something is doing, but it doesn't. Back on the main screen, none of the watched shows or movies are listed, neither as "watching" nor "watched".

What do I have to do, to enable the sync? Or is the button meant for something else? There is no auto-sync, is it?