Use the controls in the iCloud preference pane to turn My Photo Stream on or off for an Aperture library, as well as set options for automatically uploading and downloading photos between your photo stream and your Aperture library. You can also turn on iCloud Photo Sharing to share your photos with others. For more information about sharing photos, see Sharing photos overview.
The iCloud preference pane contains the following controls:
My Photo Stream checkbox: Select or deselect this checkbox to turn My Photo Stream on or off in the currently open Aperture library.
Automatic Import checkbox: Select this checkbox to have photos from My Photo Stream automatically imported into your Aperture library so that they appear in Projects view, Photos view, Faces view, and Places view. If you don’t select this checkbox, you have to manually drag photos from My Photo Stream to projects in your Aperture library.
Automatic Upload checkbox: Select this checkbox to have all new photos that are imported into your Aperture library uploaded to My Photo Stream.
Photo Sharing checkbox: Select this checkbox to share photo streams and view photo streams shared by others. Photos added to a shared stream are automatically pushed to the devices of people who subscribe to the shared stream.