This function is used to add selected files which are linked to an iTunes or Music playlist. The default name for the playlist is Yate Staging Playlist. You can change the name of the playlist at any time in the Settings - Apple App - General panel. If the playlist does not exist it will be created. Tracks which are already in the playlist will not be added.
Note that the action statement of the same name supports the direct naming of the playlist to be used.