Full Storage is 64G but the other system is 42G
How to release some space on the other system category? It occupied most of my iPhone storage and I could not use my iPhone as usual.
Question marked as
If your device is new enough to be running iOS 13.. you could try updating to the release from yesterday 13.6..
If a forced restart doesn't clear up some 'other' data
Force restart iPhone - Apple Support
Unfortunately the only other way I've found that works is to backup your phone, reset to factory settings (erases your device), and restore from that backup
How to back up your iPhone, iPad, and iPod touch - Apple Support
Restore your iPhone, iPad, or iPod to factory settings - Apple Support
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support