I can only sync a file once. I have set my sync to read only, and sync by tapping the file in "remote". This is good the first time. But if the remote file changes, and I tap the file the progress bar stops at "full" and the file doesn't sync. I've had this problem all versions. Even if I delete the local file on my phone, and try to sync it again, it doesn't help. The only solution is to delete the sync, and the local folder on the phone (the whole folder, otherwise it doesn't work). And then recreate the sync again.