drag and drop - "move to" vs. "copy to"

Hello - How can I drag and drop references into more than one folder? These folders are under the big Draft folder. I can drag and drop the reference to a folder but it only allows me to “move to”. I’d like to “copy to”. Right clicking while dragging and dropping usually allows a choice to “move to” or “copy to” in other windows applications - but not Scrivener from what I see. How can I “copy to”, instead of “move to”, references to multiple folders easily? Thanks