storage full

Take a look at this article:

About storage on your device and in iCloud - Apple Support

It explains the difference between device storage and iCloud storage,

And how to make room on either.

Good luck!

Possibly because you bought additional iCloud storage expecting to increase the iPhone’s storage, which won’t happen (you CANNOT increase the storage capacity of an iOS device).

To have a look at you iPhone storage and some possible so.itions, open the Settings App > General > iPhone storage