DropTarget triggers when dragging item already in DOM

Basically one would use DropTarget plugin for dropping local files into browser window / dom element, right? I see that DropTarget onDrop(event) also triggers when dragging items already in the DOM, which would in most circumstances be undesirable behavior. I checked the event emitted from onDrop(event), but this contains no info about what was dropped.

Is there any way around this? It’s not unusual that visitor might mistakingly/unconsciously drag an existing dom item a few px on screen, and it’s simply “wrong” that this then triggers uppy onDrop(event). THNX