White space before local html object plays

I have a Storyline 360 slide to which I've added an html animation created in Adobe Animate. When I publish and play the slide in Review 360, a 1/2 second of white space is shown before the animation begins.
At first, I thought, no problem.  I placed a graphic of the first frame of the amination on the slide.  Now, the graphic shows up f0r a 1/2 second, I get a 1/2 second of white space and the animation plays.

Anybody know what causes this?  Or better yet, how to make it stop?

Thanks in advance.

Rick