Mine is stuck at 21.54 gigabytes. It has been this way since 15.4 . I’ve contacted Apple Support and I was told this is an ongoing issue and there is NO fix . I’m very annoyed because I’m constantly having to delete photos and my business is all on my phone because I do not have an iPad for Procreate. I can’t have any music downloaded . Very close to retiring from Apple and switching to Samsung !!!!!