Screen readers and slide text vs captions and auto-play controls

I'm looking for StoryLine 360 information about how screen reader users can access both on-screen text and slide captions.

Also about how they can control which is read (and hopefully not both at the same time).

Also if there is a way to build in a way to let users choose and control whether they want captions audio to play automatically or to have to activate it on each slide.

Thank you!