How do I upgrade iCloud storage space for my iMac?
How do we upgrade the storage space for our iMac?
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.14
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You can upgrade an iCloud storage plan by using instructions in Buy iCloud+ or upgrade your current storage plan - Apple Support
Note that an upgraded storage plan is available to all of your Apple devices that are using the same Apple Account.