I'm also confused as to why I created separate playlists for each of the 3 chapters and have a 4th for Play All. WHY are these necessary????
I have assumed that you want the usual layout: a button that will play the whole timeline, and then buttons that will play each "chapter."
Is that true?
You only need the chapter playlists if you want to return to the menu after each chapter. And to do that, each chapter playlist can only be one chapter.
There are alternatives, but you are not that far off.