I created a Playback Template including my custom Endpoint Setup (a.k.a. Manual Playback Template) and a custom Expression Map.
When recalling the Playback Template in a new document, the custom Expression Map appears in the list of maps, but no instrument is added to the Play > VST Instruments pane.
I made a video showing the various steps I followed to reach to that point. Can someone point me to the mistake I have done?