When I upgraded to Sierra (currently on 10.12.2) I decided to move to iCloud Photo Library. Everything went smoothly and I've been using it on both my Mac and iPhone without issue for over a month. Yesterday I imported a photo into Photos and waited for it to appear on my phone. When it hadn't as of this morning, I did a little digging and discovered that the photo was in My Photo Stream. Looking in both System Preferences>iCloud and Photos>Preferences I discovered that iCloud Photo Library was now unchecked and My Photo Stream was enabled. iCloud Photo Library is still enabled on my iPhone however. I enabled iCloud Photo Library on my Mac and then got a popup window telling me to upgrade my iCloud storage. I'm currently on the 50GB plan with about 20GB free on iCloud. The popup window is telling me that my Mac is storing about 36GB of photos and videos, but I think since I only have 20GB free it won't turn iCloud Photo Library back on. The thing is I have only 20GB available because my Photos library is already on iCloud! Not counting the photo library, I'm using less that 5GB of storage so the 50GB plan is more than enough. Basically, I'm not sure how to proceed and don't want to do anything stupid that will end up deleting my photos (yes, I do have a backup). I tried rebooting my Mac and was thinking about reinstalling Sierra, but I wanted to see if anyone had any other suggestions first. Thanks.