Dragging audio into scaler 2

I want to be able to drag an audio file from cubase 10.5 (pro) into scaler 2. In the demo videos an audio file was dragged from the DAW (I think it was ableton) onto scaler 2. When I try this from cubase I get a ‘no entry’ icon and it wont allow it. How do I simply drag the audio file in from cubase ?