Imported image automatically added to artboard instead of pasteboard.

From my understanding a pasteboard collection contains any object created in the gray area outside any artboard. If that's the case then why can't I importan an image directly into the pasteboard and not the artboard itself? As far as what this would be used for, it could be used for stensil or an example of what you want to replicate as a set of arboards. Say you had a few hand-sketches, you scanned it and imported into XD and now you want to start building a hihger-fidelity wires.

Right now the moment I paste something or import something into XD, the image automatically attaches to the closest artboard.