same thing happened to me and my boyfriend. After the update, we tried and created a shared library but deleted it right after. Since then, I transferred 4,000+ photos to my hardrive then deleted everything on my phone because we were going on a trip. After doing so, I noticed that my icloud photos are not syncing anymore. When I go to icloud settings, it still shows that i have 4000+ photos and status is on: Leaving shared library. I initially tried to delete the photos on my pc on icloud but i was getting an error so i decided to erase them on my phone coz i thought it was just taking some time to sync. We have tried everything but nothing works!!!