Jump to Next Slide functionality: First load next slide, then jump

Good day.

I am working on a project producing around 10 modules (i.e. Storyline projects) of around 60-80 slides.

We are not using the Player triggers to jump to previous/next slide but instead have our own buttons in the slide. This works very fine when running on the hard drive.

We are now testing online in the LMS using the SCORM packages.

In one slide pretty much in the beginning, the trigger - Action "Jump to" - Slide "Next slide" - When "User clicks" - Object "NextButton 1" does not work.

On the following slide, there is a 40MB video. My suspicion is, that the video is loading, before the jump is done.

This would mean, that Storyline first loads the contents of the next slide and then jumps. Can anyone confirm this?

thanks a lot

Regards

Joerg