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i Delete everything and still have Space
The storage space on iCloud and that on your iPhone are two different things. Increasing iCloud storage does not directly increase the storage space on your phone.
Ref: What's the difference between device storage and iCloud storage? - Apple Support
The storage space on iCloud and that on your iPhone are two different things. Increasing iCloud storage does not directly increase the storage space on your phone.
Ref: What's the difference between device storage and iCloud storage? - Apple Support
Obviously, you still didn't remove enough to increase the storage required by the WhatsApp app.
See if the following can help:
If you space and buy space and they still asking me
I get Storage problems
