I upgraded to Proton Unlimited today and I've set Proton Drive to back up my whole camera gallery, a few hundreds of GBs, so it will take a while. But I noticed that it skips large videos, e.g. it skipped a 9.8GB video file. Is this intended behavior? I can't find documentation of it anywhere and it seems to happen silently. I easily could have missed it, assumed that it backed up everything down to a certain date, and deleted the only copy of the videos.
Unrelated to that, I think I've found a bug: every once in a while, the process stops, complains about low device storage and I have to push "retry" - after which it keeps going. It seems like the app doesn't clear its temporary files until it fails due to low storage. I can see the app's size growing and growing to over 50GB - which at the moment is all the free space I have - and then, when it hits the wall, suddenly shrink back to 144MB. The largest single file in the Camera folder is 17GB. Then I have to open the app manually and tell it to retry. This means I have to babysit it and can't have it back up everything overnight.
Edit: app version is: Proton Drive 2.3.1. Phone is Samsung Galaxy S22+, OneUI 6.0, Android 15
Another edit: I am now seeing this happen while the app should be idle! Its storage usage just keeps climbing and climbing.
It probably needs some space to compress/archive the files to transmit and not just send them as they are. At least that could be an explanation why local device storage is needed - and it seems you're running petty low on that