All annotations can be copied using Ctrl+C (Mac: Cmd+C) and pasted using Ctrl+V (Mac: Cmd+V), by right clicking (Mac: Ctrl + Click) and selecting copy then paste, or by holding Ctrl then dragging the annotation. Annotations can be copied to anywhere within the document or across document opened in PDF Studio.
The copy command Ctrl+C (Mac: Cmd+C) will copy any selected annotation to the system clipboard. If an annotation is in the system clipboard when the paste command Ctrl+V (Mac: Cmd+V) is pressed, a copy of that annotation will be placed in the center of the screen. On subsequent pastes at the same location, the annotation will be pasted at a slight offset so that they are not placed directly on top of each other.
Any selected annotation can be duplicated by holding the Ctrl (Cmd on Mac) key and then clicking on the selected annotation and dragging to where you would like to place the copied annotation. This will also work when more than one annotation is selected at a time.