Much of this information is taken from https://www.macworld.com/article/232651/iphone-other-storage-what-is-it-and-how-do-you-delete-it.html
If you have ever checked your ipad [or iPhone] storage by going to
Settings –> Other –> iPad Storage
you will have seen the space taken up by apps, documents, video, audio, etc. — and then a mysterious “Other”.
The “Other” category can be anything from a system update that has been downloaded but not installed, to web browser caches, logs, Siri voices, Messages, and many other odds and ends.
If your “Other” category has become bloated and taking up too much room on your iPad, here are some tricks to try and reduce it.
1] Do the iPad reboot dance.
2] Clear your Safari caches by going to Settings –> Safari –> Clear History and Website Data
3] Change Messages to save fewer old messages.
Settings –> Messages –> Message History.
Change it from “Forever” to “30 days”.
4] If all else fails, and you don’t have enough room to install the system update – bring it to the ARC. We have other options there to help.
The article above has some additional options to explore if you are reading this article, trying to fix your personal device. Take a look!