Controlling timeline playback in play mode

Thanks in advanced for your time.
I am wondering how to allow a user to control and timeline animation by scrolling down (like you do to control instagram, for example). There will be a big animation and they can go back and forth depending on which direction they scroll.

Any help would be really appreciated!

Not sure I completely understand the question, but you can control the time and playback explicitly using PlayableDirector.time and PlayableDirector.Evaluate().