Need To Create a "Play/Pause" button in Captivate 2019

Hello!
I have the latest version of Captivate.
I need to create a single button that plays and pauses the current slide.

The information I am finding online is for older versions, and I can't get those tutorials to work properly.

Here is what I need to happen: The Play/Pause button itself should start off in the "Pause" state, because the slide itself will begin playing automatically. When the user clicks this pause button, the image of the button changes to a "play" button and pauses the video. When the user clicks the "play" button, the image of the button changes to the "pause" icon once again and the video resumes playing, this play/pause cycle can happen an infinite number of times.

I know how to create button states, and I've done some work creating advanced actions. 

Can someone steer me in the right direction? Thank you for any help!