How to free up device storage but keep it on iCloud?
I was wondering if there is a way to keep files on iCloud, but not on the device making space locally on the device but the files are on the iCloud.
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Only if you use a third-party app like Google Drive.
For photos, you can save space on your device by using iCloud Photos. See the 'If you need more device storage' section in:
Set up and use iCloud Photos - Apple Support