What to do if it just says loading, and not actually downloading the app
How to get an app to download after deleted. It just keeps saying loading
iPad Air 3, iPadOS 14
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Restart the iPad, and try again.
Check your payment method.
If there’s a white grid-like app icon showing somewhere, delete it (or try to delete it) and try again.
There’s a picture of that busted-app icon here: white grid app icon - Apple Community
And what Apple suggests here: If you can’t download or update apps on your iPhone or iPad - Apple Support