"Other" is storage used for anything that is not explicitly listed. It's normally small; 500 MB to 1GB, depending on the capacity of the phone. If it is much larger than that it means there is data corruption in the phone's storage. This is most commonly caused by an interrupted sync. You can clear it by restoring iOS using iTunes on your computer, then restoring your backup (a backup is made automatically when you initiate a Restore, if you didn't back up manually).
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"Other" is storage used for anything that is not explicitly listed. It's normally small; 500 MB to 1GB, depending on the capacity of the phone. If it is much larger than that it means there is data corruption in the phone's storage. This is most commonly caused by an interrupted sync. You can clear it by restoring iOS using iTunes on your computer, then restoring your backup (a backup is made automatically when you initiate a Restore, if you didn't back up manually).
this will help,
this info is a little old but useful What is “Other” Storage on an iPhone or iPad?
this is newer info https://www.imore.com/how-find-and-remove-other-files-iphone-and-ipad
What is this ‘Other’ in iphone storage?