Yeah that is a limitation of iOS because Apple is so aggressive with background tasks most photos apps don’t upload in the background unless you only use iCloud.

Glad you got it working enjoy

I just tested it on android it does backups in the background for me on android 14 as long as I have it unrestricted on app battery usage if it’s restricted it won’t upload in the background make sure you have it unrestricted so it can run in the background.