Next button appear on video end

I'm a bit confused because I'm new to storyline.

Am I understanding it correctly? The solution is to disable the controls of the video so that people can't seek back and forth on the video?

I get that that would solve the issue of the two timelines and they would always be in sync and then the trigger should work but then you can't really replay different parts of the video, skip through parts etc, seems very bad to me. I was also wondering if there's a way to have better controls in place like speed control/more modern look etc but that's another discussion.