How was this animated button made?

This is pretty close to the original.

https://360.articulate.com/review/content/5c45589e-b384-43bd-9304-24da8e93bc7e/review

It's hard to tell exactly what approach was used in the example. This version combines animations, motion paths, and state changes. Storyline is a bit iffy with state changes, and the order of triggers makes a big differnence in animation timings. Also, sometimes the state changes just don't get applied. 

To make a more reliable rendering, it would probably be better to craft this with custom CSS and apply it to the elements. That would take more technical work however.