Storyline won't jump to the next slide

I only looked at one slide: Timeline Slides, but I have one suggestion that may save you a lot of grief down the road. It is glamorous (and necessary with some apps) to use groups, but their use is fraught with potential problems in Storyline. Using them is a bad habit to get into, as they should be used only as a last resort. They don't play nicely with states, motion paths, triggers, or anything else. In your case, you can place the rectangle, and the video on top of it, and have the same look. If you want to move the two of them, you can rubberband around them and move them together. It's quicker than making a group, and safer in the long run. Resizing two objects at a time, whether they are grouped or not, seldom turns out the way you want.

Run your project through SCORMCloud. If it works there, the problem is with the LMS.