Hi. I want to unlink audio from video so that I can move video clips around and insert new clips into the timeline without changing the audio music score. I click on the video track on the timeline. The whole track turns blue. I then right click, but I do not see the "Unlink from video" option. I click on the "Clips" tab, and the unlink options a greyed out. Why is this happening? I am using the free download version. Is this not supported on this version?