...
Whether a playlist is public or private is determined by the first resource added to the playlist.
If it is a public resource, the playlist is public and only public resources can be added.
If it is a private resource, the playlist is private and only resources with the same permissions can be added.
If the public/private status of a playlist needs to be changed, all resources must be removed. This then allows the status to be taken from the first resource that is then added to the playlist.
It is not be possible to edit the permission rules on any private resources that belong to one or more private playlists. If you need to edit the permission rules on a private resource, it is necessary to click on the “Remove from playlists” button first. A notification is sent to the contributors & admins for affected playlists so that they know the resource has been removed.
To add a resource to a playlist, start typing the title of the resource and the picker will list those resources with names that match:
...