Storage

This may explain why:

What's the difference between device storage and iCloud storage? - "Learn the difference between your device and iCloud storage, ways to manage your space, and where to buy more if you run out." Click here --> https://support.apple.com/HT206504

BriannaThomas Said:

"Storage: Why does my phone keep saying i’m running out of storage even though i pay 99 cents a month for storage? Should like my music and all that stuff be included in my icloud storage?"

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Check "Other" Storage:

What happens when you view the storage on your iPhone? See if "Other" is taking up lots of space, which would be "internal storage" - nothing of iCloud storage ("external storage").

How to Clean "Other": How to Clear "Other" in your iPhone's Storage - Use Backup - User Tips