audio and img does not seem to work in IE11 or Edge

Hi all,

I have found directions to use the <audio> tag like:
<audio src="sounds/testAudio.mp3" autoplay>
Your browser does not support the audio element.
</audio>
and <img> tag like:
<img src="images/testImage.png" height="100" width="100" />
but for one reason or another neither the audio or image works in IE11 or Edge.
Both audio and image works in Firefox and Chrome, however.

It seems to not matter what story format I am in (Harlowe or Snowman exhibit the same issue).