Methods and apparatus, including computer program products, implementing techniques for retrieving a first version copy of a first stock content item from a first content hosting server storing a plurality of stock content items, each item having one or more stock content versions, each item having a content identifier that uniquely identifies the item at the first content hosting server; adding identifier metadata to the first version copy, the identifier metadata including the content identifier of the first stock content item, and storing the first version copy with the added metadata as a first designer copy in a designer storage for later use in a designer system; and in connection with a user interaction with the designer system involving the first designer copy, using the identifier metadata from the first designer copy to retrieve a second version copy of the first item from the first content hosting server.