I want to update my iPhone 12 (64GB) to the updated software but I can't as there is not enough storage space available. Most of it is taken up my the Music app, which I don't use. For music I use the VOX app because it supports FLAC, but for some reason the Music app taking up 11GB but I never imported music to the Music app and don't see any music in the Music app, so I don't know what is taking up that 11GB in the Music app. I have about 21GB of FLAC files in the VOX app. How do I free up the storage from the Music app but not lose my music in the VOX app?