I've been waiting for a week for my 8 photos to sync with iCloud. I have plenty of space, tried ALL of the suggestions like turning icloud photos off and on, rebuilding library, restarting the mac, killing processes etc and NOTHING works. I specifically use Mac OS so I don't have to put up with this BS. I have a gigabit connection and I check through activity monitor, NO DATA is being sent or received!!!! It is stuck and it will be stuck forever it seems, I have HAD IT. Anyone suggest anything that's not suggested before? My photos library is around 50GB, and I keep adding photos only a few at a time to avoid this issue, but even then it got stuck. Whoever is in charge of iCloud should be CANNED. If a photo does not meet your "requirements" why not ignore it and tell me, I'd be happy to delete it or modify it.