Okay here you can see the current state: https://youtu.be/fIP1E9rO_GM
Syncing with Cloudlog (just uploading of QSOs) is working. I don't know if a full sync in both directions is even possible. Would have to read more the code and think about it.
I think I will do some more polishing and then setup a Test-Flight for iOS. Also Android in the meanwhile. Who would be interested for Beta-Testing? My plan is also to get the app available in the usual App stores.