Turn on iCloud Photo Sharing in Aperture
You can turn iCloud Photo Sharing on and off independently of My Photo Stream.
Turn iCloud Photo Sharing on and off in Aperture
Choose Aperture > Preferences, and click iCloud.
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Do one of the following:
To turn on iCloud Photo Sharing: Select the Photo Sharing checkbox.
To turn off iCloud Photo Sharing: Deselect the Photo Sharing checkbox.
After you turn off iCloud Photo Sharing in Aperture, you can continue to add photos to and remove photos from your shared photo streams using your other Apple devices.