3D FlipBook - Audio Not Loading in PDF - Version 1.10.11.1

Hi,

I have created a book from PDF file, when I use this code to add audio in a page's HTML field, I get nothing!

but I noted that when I press F12 in Chrome, I see the mp3 file in the network trace with status 206. Pasting the MP3 file link directly in browser plays the file without issues, tried multiple MP3 files without success. I am hosted on wordpress.com running nginx.