Wow the syncing feature can be useful and super frustrating!! Firstly, since this app also syncs unnecessary folders like 'screenshots' & 'whatsapp' stuff, I went ahead and deleted these folders on G photos, only to find they got deleted off my phone as well! Now they're all gone without saving them.. Plus even if you choose the option to 'stop syncing' certain folders, it still syncs them! Would be helpful to at least provide a warning as to what you're deleting off the phone as well.