iCloud storage plan
How can I amend my iCloud storage plan when signed up to Apple One? does the 50GB show as a subscription?
See the following from What happens to your iCloud storage when you sign up for Apple One - Apple Support
If you need more iCloud storage
After you subscribe to Apple One, you can buy more iCloud storage if you need more. With both Apple One and an iCloud+ plan, you can have up to 14TB of total iCloud storage.