(This item applies to the Comment dialog box, accessible through Insert | Report Command | Comment.)
This becomes enabled if you first mark the Display Full Screen check box.
The Remove Media button removes the media from the comment. While this removes the media from the measurement routine, be aware that due to limitations with the Windows file system, you may still see a file size higher than it was originally before you imported the media. In these cases, you can always do a File | Save As and save the measurement routine to a different file name to get a measurement routine with its original file size.