I have not received any success from Sonos support. I am hoping iTunes folks will have a better understanding of my issue.
I have created playlist folders in the music app. I have 271 playlist and 52 folders .
The Sonos app shows a notice that I have to many playlist to import. The app sees the folders as playlist, including a playlist called library which list all the songs in my library. Here is an example. I have a folder called "The Blues", it has five playlists included. Sonos shows a playlist "The Blues" which includes all the songs from the five playlist. The So