
Tom
What's your Android version and phone model?
Can you go to Sync and enable: "Background sync" (top orange sync icon)?
This will guide you through disabling the battery optimization settings which might help uploads not to get killed when you switch to a different app.
Once you went "through" disabling battery optimization you can disable the Background Sync if you don't need to use it.
Please let me know if that helped by any chance.
Yes it helped, now everything works perfectly