I don’t know what difference it makes, but I renamed all the tracks (song1 - song4692) - updated the library, and now shuffling adds them all to the queue. Curious.
Hi @orangekevin
Welcome to the Sonos Community!
Sorry to hear of this issue you were having.
That is curious! I cannot imagine why that might be - I can only suggest getting in touch with our technical support team if you encounter anything similar again.
Are the tracks in sub-folders, or all in one folder together? I know that the folder view of the Music Library in the Sonos app will only offer the Play/Shuffle buttons when there are playable files in the current folder, and I don’t think they add files recursively from sub-folders, if that helps?