Hi Daniel, thanks for your quick response.
I have shared a sample of the ebook here:
I don’t see any problem with audio when viewing in iBooks for Mac (both preview and published version). Its only on iPad/iPhone that I don’t hear the audio with the published version.
Its probably worth mentioning that in iBooks Author I set the widget to autoplay. Not sure if it is related or not.
I appreciate your help on this as I don’t know what else to try.