I have Aperture 3 on a Mac running Mountain Lion, and an iPhone and an iPad running iOS 6. I have Aperture configured to automatically upload and download photos to and from Photostream. My iDevices are configured the same way. The photos in my Aperture library have a little icon in the lower right corner to show they're from Photostream, as opposed to having been imported from my digital camera. Are those Photostream photos in my Aperture library permanent, or will they disappear when they are no longer in the last 1,000, as they do from my iDevices? The photos are imported permanently when I physically connect and sync my iPhone or iPad, but is that step necessary?