Hey,
My survey include questions with the possibility to play audio samples. I embedded the audio player with a simple HTML code:

<div style="text-align: center;"> <span style="font-size:20px;"><strong>
<audio controls="" preload="auto" style="width:100%"> <source src="EXTERNAL_URL_TO_MP3_AUDIO_SAMPLE" type="audio/mpeg" /></audio>
</strong></span></div>

I tested in Chrome, Safari, and Firefox. In Firefox, the player is visible but PLAY button doesn't work. I tried some simple variations of the HTML code and I tried to clean my cache, but apparently this did not solve the problem. Any tips?
Thanks