To create a new audio playlist, go to the menu Content Management > Audio playlists 

Choose a title, a description (optional) and an image.

PLEASE NOTE: on an audio playlist page, only the square format (1:1) is displayed (see below).

Then select the audio content on the left panel to create your own playlist of elements (on the right):

 

 

Please note that you can only add audio content (neither videos nor other playlists) with this feature. To see the other editorialization options, see this page

On the platform it is displayed like that  :

 

Note: the related casting on each audio track appears for the first 2 names filled in.