Rollover slidelets supported as swf publishing output in Captivate 8?

I am part of a team designing a Captivate project for low literacy people. One of the requirements by the client is to have audio captions on all clickable items, like buttons and instruction text etc.

The only way we have figured out how to do this is to add rollover slidelets to the buttons that have a rollover effect to play audio representing the button action (eg 'submit'). We export it in html5 and randomly these slidelets will make the slide jump to the next slide. It does not happen consistently, nor all the time. On the timeline the rollovers are there for the duration of the slide.

Is there something I'm missing?