For Photographers, how do you get more cloud storage than 2TB?

If you buy an Apple One plan, you'll get the amount of storage in it on top of what you already have. You can get up to 2TB more storage.

About Apple One: https://www.apple.com/apple-one/

You can't buy just the storage. To subscribe to apple one on iphone, go to settings>apple id>subscriptions>get apple one

I hope this helps!