iCloud storage
I bought 50GB of iCloud storage but when I come to take a video it comes up with iPhone storage full and won’t let me take anything even though I have iCloud storage
iPhone 6s, iOS 13
the problem in this case, is that the physical hardrive on your iPhone is full and you will have to free up some space.
For information on how to check your device storage, you should refer to this article:
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support