Storage

The storage on an iPhone can't be increased, it is a fixed size. You purchased iCloud storage.

What's the difference between device storage and iCloud storage? - Apple Support

CHRISTIEANA Said:

"Storage: I just upgraded my storage however when I open photos it still says I have no storage."

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View iCloud Storage:

Sure these are downloaded? If these are uploaded to iCloud, then they will not be stored in your internal storage. So, viewing iCloud storage, do you see it there?