Is there a way of dragging an object from one Scapple to another?

I’d like to work with two Scapple files open at the same time. It would be GREAT if I could just drag an object from one file to another. At the moment, dragging creates a copy of the object. Is there a way to drag it (like holding down a key) so it will MOVE the object without creating a new copy?

Thanks much for your help!