Mp3 Uploads not working via upfront, not showing from dashboard

Hello all,

I want to put an audio file on my page. Upfront/Scribe
I had done so before by going out of upfront to the.... dashboard (?)
and using this code [playlist ids="name-of-file"]

Add Media via upfront uploads a broken file- blank box for mp3 file, mp4a 19 m

Leaving Upfront and going to the Dashboard (what is that thing? The old, pre-upfront dashboard). Add media does work, file into Library.
Typed in the code, the audio player bar shows up, I get to edit name,caption etc.
But does not show up in Upfront or on the page.

Text view in Dashboard pic attached.
Updated page, no audio- pic

Any thoughts greatly appreciated.

Peter