Tracks added; a folder counts every track it holds.
Number of tracks before the addition.
Entries that were not usable.
Index of the playlist.
Unique identifier of the playlist, formatted as {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}. Pass as playlistGuid to reliably target this playlist.
Number of entries in paths.
Always true here; a failed call resolves with ApiFailure instead.
Number of tracks after the addition.
Successful response from
playlist.addPaths.