How come when I "preview" a scene the audio plays but when I "publish" it, it does not?

Hello Anne, 

Thanks for reaching out!

Most modern browsers prevent audio and video files from automatically playing until the viewer has interacted with the slide. You can read more about this policy by checking out this official Google blog.

One workaround that you can do is to add interaction at the very beginning of your course to ensure that your media files will play along with it. Here's an edited version of your course to demonstrate this workaround.

Let me know if you have any questions!