[KevinH]

Attached is a working copy of the epub (it works in Sigil anyway). The issue was where the external javascript was being loaded. That javascript will fail to find the webvtt-player node unless it is placed **after** the div in question. It will NOT work if loaded in head like normal javascripts are.

Unfortunately, that javascript code is minified and hard to follow.

Since the epub is over the site limit of 20 meg in size, I have removed the audio and vtt files to create this epub. Just add them back with the names you used before and all should work.

Hope this helps,

KevinH

ps. to get this to work use Sigil's Add menu to add back:

audio.mp3

and

transcript.vtt

And they should end up in Audio/ and Video/ respectively.