Is there a way to force Google Photos to upload in the background? I recently download the new Google Photos app for iOS, and I noticed that my photos are only uploaded when I have the app opened and in focus.

Background app refresh is on for the app.

Is there another setting I can tweak to make it upload even when I'm not using it? Otherwise I need to remember to open it from time to time to have my pictures safely backed up.

Is this a limitation in iOS that cannot be worked around? Is it something that should be programmed in the app itself and it's not?
So I was experiencing the same issue and turning off background app refresh in for Google Photos under the settings app and then turning it back on seemed to do the trick for me.
Also when phone is in power saving mode background upload also disabled.