how to delete on icloud drive to find some space
how to find some space on icloud because the space on phone is 70 GB
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If you are using iCloud to store your data, you will also have to rely on space on your device because iCloud stores data in the cloud and on your device (smaller footprint [optimized]).
Manage your iCloud storage - Apple Support
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support