You have completely fill up that iPad full of data!
You should never, EVER, completely fill up with data ANY computer or computing device.
A 32 GBs iPad after formatting starts out at approx. between 28-29 GBs.
Actual usable internal user data storage space on a 32 GBs device is approx 19 to 20 GBs, max!
Newer versions of iOS/iPadOS are very large data sizes, now.
You need to free up free data storage space on an iPad/iDevice and you need to start by backing up your iPad to either Apple's iCloud or by connecting your iDevice to a computer running the latest iTunes and/or some other offsite, “cloud” data storage/backup services, like Google Drive/Photos, DropBox, BOX, Amazon Cloud Drive, Flickr ( for photos/images ), etc.
Then, delete any installed apps that you no longer use or use infrequently enough that they aren't missed ( you can always reinstalled any purchased or free apps at some time later, as you need them ).
Then, thin out/delete any music/videos/movies/TV shows/
screen recordings/images/eBooks/eMagazine/iBooks/audio books/Documents/PDFs, etc.
If you use a POP email account on your iPad, delete/thin out any old saved emails that maybe saved to your iPad.
To permanently delete photos/images off of your iDevice go into the Photos app and find the Recently Deleted folder/album and permanently delete any photos/images stored in that folder/album.
Also, you can check to see what stuff is eating up all your valuable data storage space by going into the Settings App, General Settings Panel, in the right hand column, tap Storage & iCloud usage panel ( in iOS 11 and later, it’s iPad Storage ), in the top Storage Panel, tap the Manage Storage panel, wait for a list of apps to generate that will tell you how much space each app is taking up on your iDevice.
Then, do a hard reset of your iPad by holding down both the Home and sleep/wake buttons simultaneously until your iPad goes to black and restarts with Apple logo, then release the buttons.
iDevices need to maintain, at the very least, a minimum of between 2-3 GBs of free data storage space, AT ALL TIMES, to insure normal/nominal/acceptable performance and operation of the OS!
Best of Luck to You!
