I don't understand how this can possibly work within the constraints of iOS, and I've done some digging in the code.

Anyone else find where they are doing anything iOS specific to enable background uploads when you don't ever open the app? Apple go to great lengths to make sure the user has to use the app before it allows "budget" for background processes to execute within.

My guess is that as part of the Ente team, you open the app semi regularly, which is enough for the device to give some budget for your cloud sync process to kick off in the background every now and then.

For me, I would set Ente up and forget it. But I'm 99% sure in that case it would simply stop syncing after a few days.