Thanks for the reply. I tried your way. But, the animation won't start at all now. And not just inside Muse, in Edge animate too. Here is the project file:
Appreciate your help!
As scroll effect in Muse can only control the main timeline it will not be able to control the nested timeline (in symbol).
only option would be to create each animation in the main timeline and group it to avoid complexity.
But I have done this before. Once, I created a slideshow with lots of symbols inside it. There were even symbol inside symbol. You can see it here: http://vmsdesigns.in/venture/home_blue_edge_animate.html
Muse handled it very well back then. But, now it seems to have lost its capabilities. Anyway, I appreciate your help.