I made the mistake of upgrading the app on my iPad as prompted it’s pretty rubbish. To be honest you will not be able to access your local NAS and if you have a port, the line input will disappear.
The only thing that seems to work are subscription streaming services, shame on Sonos for this much awaited and highly publicised upgrade
I don’t know who did his acceptance testing on this app, or what set up they had, but I imagine will not work for most of you