Make sure Shared iPad users have storage limits in iOS 10.3 and later

After you update a Shared iPad from iOS 10.2.1 or earlier to iOS 10.3 or later, user storage limits won't be enforced until you remove the existing user accounts from the device.

When you set up a Shared iPad with Mobile Device Management (MDM), you can designate the number of students it can support. Shared iPad automatically sets up equal storage limits for each user. After you update to iOS 10.3, those user storage limits aren't enforced. You must use your MDM solution to remove the existing accounts from the device, then let users sign in again. The Shared iPad downloads the data from the cloud to the device when they log in.

When you delete the accounts, make sure you don't remove the user if they have data that hasn't been synced to the cloud yet. Wait for the sync to complete before deleting the user from the Shared iPad.

If you erased a Shared iPad, or set it up for the first time in iOS 10.3 or later, it automatically enforces user storage limits.