See who subscribes to shared albums in iCloud
You can see who’s subscribed to shared albums you own or subscribe to.
On a Mac using Photos
See Add or remove subscribers to shared albums in Photos on Mac in the Photos User Guide.
On a Windows computer
Go to your shared albums.
In the iCloud for Windows app (version 10): Choose Start menu > iCloud Shared Albums.
In the iCloud for Windows app (version 7): Open File Explorer (Windows 8 or later) or Windows Explorer (Windows 7), select iCloud Photos, then double-click Shared.
Double-click the shared album whose subscribers you want to track, then click Info or Options in the toolbar.
The Info button appears in the toolbar for a shared album you subscribe to.
The Options button appears in the toolbar for a shared album you own.
Activity doesn’t have subscribers.