This takes a minute to understand what controls the move and where to use it. Usually move your curser to the lower half or bottom of the wave file and and there a square cross will appear. Left click and you can grab the wave file and move it (either shorter/further along the time line of it’s Track or then to another Track). Dragging wave files is basically to help set up a Montage from your created Tracks. If you are in a File Group, for example, you cannot move the wave file by dragging.