Allow uploads from the Apple iCloud service (that is what one of my kids uses to save all of his photos).
iCloud is a service from Apple and only for Apple. It is not open to 3rd parties. So none except Apple can access to this service to build new application. For this reason it is not possible for u stop import pictures from iCloud to the frame and no one except Apple is able to do so.
The might change in the future so we will follow up on this closely but on the short term there is no solution.
The Pix-Star Customer Support Team.