Audio doesn't work in any browser on an ios device

There are of course many ways of playing audio in a Captivate project. For example, this project used a combination of triggered audio, and slide audio. Both played for me on my iOS devices. Perhaps you can provide more detail as to how you added audio to your project. 

Try this in your iOS device. This is a sample work in progress project that contains audio. 

https://captivateteacher2020.s3.amazonaws.com/taking_action_against_discrimination_and_harassment/index.html