Title says it all. I take a picture with my iPad, upload picture to where it needs to go in Dropbox. Then I delete the picture from photo stream (and sometimes also from the iPad). Then, a day later, I open Aperture and there's the picture, downloading into aperture from the photo stream. How can I stop this? I don't want to sort through aperture to delete the photos I already deleted from the iPad (which is a pain).