Hello Calin,
It is not working 🙁

I use Single Post Template – Pulses PRO to show the post and made sure it uses “Single Post Featured Image” which is set by default. No Audio player is visible, not even the Featured Image set for the post is displayed.

Also, on a different installation of the theme with the same template files it works. I compared all settings but cant find a difference.

Same for the footer where we have a Flex Block 1 and the player showing with the post title and link, on the other server it does not show the player.