I got the code embed from Spline and pasted it into my Anima app. Although I can see my animation running in the preview window, it doesn’t show up on my design file or in my prototype in Figma. I’m using this for the first time and I can’t figure out why it’s not working.
Hi there 
As I have explained via email, the behavior you have described is expected, as Figma’s prototype is not aware of the embedded element. The embedded code will be visible in all other platforms: Anima’s preview, hosted project and of course in the exported code project if you decide to download it.
Hope this helps!