icloud photos not optimizing storage
Yesterday I upgraded my iCloud storage from 5GB to 50GB, because the storage on my 64GB iPhone was full and it said that if I turned on iCloud photos I could save 29GB. I turned iCloud photos on, but my storage is still full, and I'm new to using iCloud so I have no idea how to fix this, what do I need to do?
Thanks.
iPhone 6s Plus, iOS 13