Why won't this linked animation start? (Storyline3)

Hi all.

I'm trying to link from an e-learning to the below animation. I've tried embedding the link as a web object, and simply hyperlinking to it from a button in my e-learning.

When trying to open the link, I first got a message saying the web page doesn't allow for viewing in frames. So I changed the Storyline settings to open in a separate browser window. 

This opens the link, but will not load the animation. I just get the background. If I open the link outside of Storyline, the animation loads and works fine. 

On inspecting the page using Google Chrome (attached), I can't see anything that might demand a specific way of opening the page before the animation will load (although I'm not that savvy with HTML).

Can I force this animation to load by adding some javascript or variables to Storyline, or must I ask the web page developer to change the way the content is hosted?

Thanks.

https://www.howacarworks.com/3D/diff