In order to make a reference file for sound to work to I’d like to export the animation of a time line that isn’t the ‘Main Timeline’ is it possible to do so?
When you load a scene, the Main Timeline of the first scene will play (and this is what is written to a video file as well). Whatever happens on that main timeline (or other timelines which are triggered) will be written to video as well. So to export video from an additional timeline, use a Timeline Action to trigger an additional timeline anywhere on the Main Timeline.
AH of course! Thank you for the help Daniel!