Editing Videos in Storyline

I have used storyline to edit a training video to cut out irrelevant portions from being shown. In storyline it now exists in 4 pieces within a "scene". It seems that I am unable to make the transition between these pieces seamless without the use of a button and trigger. In other modules I am able to make a slide go to the next slide automatically when the timeline ends. When I try to utilize this same type of trigger logic to make one slide video proceed to the next, nothing happens; the video simply stops.

I added "Next" button which does work but it is rather clunky. I would like the transition to be seamless. Any advice is much appreciated.

~Sarah