The topic does not seem to be new, but I have not yet been able to see a solution. I noticed it for the first time today. I took a series of 7 photos with my phone. Of these, 4 were uploaded. Later again about 35 photos, of which 15 were uploaded. There is no error message anywhere, Internet is permanently available, the restriction to Wifi is disabled.
In principle, it seems to work, just anything but reliable.
Until a few days ago, I had installed the version of F-Droid, so I can’t remember any problems. But since the F-Droid version obviously doesn’t work with push, I switched to the version from the Google Store. Here, too, various push notifications about updated apps have not been delivered.
Aren’t the apps tested beforehand?