You can add and remove subscribers to a shared album using Photos app. You can invite a subscriber, remove a subscriber or re-invite a subscriber in Photos app. Select the 'Public Website' check-box if the person you are inviting doesn’t have an iCloud account. If you invite or re-invite anyone to view a shared album, then the person receives an email asking him to subscribe. If you remove an existing subscriber, then the album is removed from the subscribers devices.
Here are the steps to Add and Remove Subscribers to Shared Album:
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