I have an iCloud photos library of about 70GB and have enabled it on my iPhone with "Optimize iPhone storage" enabled. However, when I'm on the road and want to see a picture in full res, it's not downloading over cellular. When I'm back on wifi I can download without problems. I understand that Apple is doing is to save our precious cellular traffic usage, but I don't see an option to enable it. I have enabled cellular access for "Photos" and also iCloud drive has cellular access, but nothing helps for iCloud Photos. Has anyone got it to work over cellular?