To get more storage on your iPad, you can go into the device's iCloud menu, where you can buy up to 2 TB of iCloud storage ...
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How much iPad storage do I need?

The amount of storage on an iPad can vary hugely, from just 64GB on the basic configuration of the standard standard 10.2 and 10.9-inch iPads all the way up to a hefty 2TB on the iPad Pro 11 and 13.
Here are a variety of iCloud tips and tricks you can use to optimize your experience with Apple's cloud storage service.