iPad Storage
My storage is nearly full. My apps, photos and such are minimal. However, the category “Other” is huge. What is “Other”, and how do I clean it out?
iPad Air 2 Wi-Fi
Other is a collection of system and temporary files that over time can grow. The best way to reduce other is to backup your iPad, then restore it from backup.
You can do a restore from iCloud or from using your computer and iTunes.
Use this link as your guide: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support