So a big thanks also to “helpingiskind”
So as far as windows users go, sorry not sure about iOS users here, but the crucial things after updating the windows app for W10+, you need to turn on “Advanced Sharing” in windows, and make sure that your music library whether it’s stored on a NAS or just an ext usb drive, or internal drive is added to your library. So this is the example that helpingiskind gave:
Please right-click on the Music Folder > Properties > Advanced Sharing > Add Sonos Wireless HiFi System to Read/Write:

Then go to Sonos settings on your laptop and add “My Music folder” and it will sync.

Because the android app is terrible, I rolled back to the version 78 and found the .apk for that and then the app works like it’s used to and marries to the W10 controller app nicely….which has also caused the update issues along with the apps for android/apple to be very annoying!
Good luck and lets hope the next update from Sonos makes things nice n easy for everyone..
Hope this helps everyone and thanks to everyone elses ideas across this forum!