Currently the iOS app allows photo's to backup photo's from the photo's app. But the feedback is so sparse I do not have the feeling it is doing anything.
Please show the real number of files that still need to be processed. It only shows numbers like "750+ items over".
And the background should be a clear progress bar. Or is that small white line on the left the progress.
After more than 2 hours I do not see any changes. Is it stuck of are the files to big? No clue.

Best is to show the real number, a progresbar for the current photo. And somewhere to see a log of the last activity in the last week or so.