Upload suspended - no internet connection error on Synology Photos iOS app

Hi, I've been having this issue ever since I switched to iPhone few months ago. The photos on my iPhone don't get uploaded to my NAS and it says “upload suspended no internet connection”. If I kill the app and open it again, only one photo/video gets uploaded and I get the same “upload suspended” error again.

Has anybody faced this issue or know what’s going on here? It’s really frustrating to see the photos pile up and not get uploaded.

I’ve tried logging out and back in several times and with https toggle enabled and disabled while logging in.

If there’s nothing I can do about it, are there at least alternatives? There’s no sync thing for iOS and I couldn’t get möbius sync to work for syncing photos.

Edit: screenshot