Play audio (I hear nothing in the preview of the app)

I have added audio to a blog post, and in the AppmySite preview there is the play button, and once I click on “play”, the track appears to play. However, in the preview app I hear nothing. Has somebody added audio (soundcloud or an inbuilt audio player from Wordpress) and can confirm that in the final app the audio can be heard? Or is there a way to hear audio playing in the preview app?