Third party Cloud service not syncing files / photos on iOS mobile in background mode
I am trying to use 3rd party Cloud service to sync photos on my iOS mobile. I gave the app the permission to run in the background (and the Photos). However, it do not seem to sync the photos on the background mode. I have to open the app for the sync to progress. Specifically, I have tried this with MEGA Cloud and pCloud apps.
Questions
(1) Are there any restrictions in iOS that disables the file syncing to Cloud in background mode or perhaps, there is some setting that I need to enable some how.
(2) Is there a workaround for the sync to work in the background.
iPhone 14, iOS 17