How do you free up space
How do I free up system space and other
Windows, Windows 6
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In order to free up some of the space taken up by the “other” category, make sure that your phone is fully updated.
Clear Other storage on your iPhone or iPad - Apple Support
Another thing that can help is to backup on a computer, then restore the backup.
How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
The system storage can’t be reduced.