I have the same problems, can use the Music Library fine on the pc. When it comes to the android, there are more times than not when the music library doen’t even appear. i suspect the android app is stil very ‘buggy’ as there is is still a lag when i open the app till anything appears. I have 1gb wifi and nothing else I use has the lag problems that Sonos has.
I am assuming these ‘music libraries’ are stored on a computer, or hard drive, and not on the mobile devices themselves. Local to mobile devices libraries have been blocked by the OS manufacturers as a security concern.
In S2, Sonos has changed the way that their new app accesses audio from shared libraries on the local network. The previous S2 App supported SMBv1 and HTTP protocols for file sharing, but these have known vulnerabilities and are no longer used by Microsoft, Google, Apple, Amazon etc. and all these companies, including Sonos, have now shifted to using SMBv2 (or higher) file sharing. You may need to upgrade your shares… see these links depending on how you share your library tracks…
For MacOS users, see this thread.
For Windows users, see this thread.
Sonos sent out notices both in the S2 app, and in email, about these changes. They also updated the FAQ to reflect the update. While they have stated that the local library system continues to be worked on, I do not expect them to resume use of HTTP or SMB v1, so if your computer uses them, I’d recommend re-adding your share, as is indicated in the controller, where it says ‘We’ve made security changes to supported libraries. You may need to re-add your library”.
The access method has not changed on the computer controller applications, which at this point have been in ‘maintenance mode’ for years, only receiving security patches, not feature updates, and are soon to be retired in favor of the web based controller.
If you’re having trouble finding this area in your controller, open the S2 controller, click on the gear icon at the upper right of the screen, then the word ‘Manage’ under it. Next, click on ‘Music Library’, and the page to enter/modify your local library will come up.
If you continue to have issues, I would recommend that you call Sonos Support to discuss it.
My music library is on a NAS supported system SMBv2.
Odd, mine is as well. And I have no issues at all in playing it from an iOS device, such as the iPad or iPhone. I’d certainly suggest, as I noted in my previous reply, that you call Sonos Support directly to discuss it.
When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
I certainly appreciate the detail you provided.
Thank you!
I recently re-added my share and had to also re-add the full library. I'll look at the protocols and see if that needs changed and makes a difference. I just find it odd that after resetting the share options I can see and use the library from Windows and MacOs but not on any phone.
Yea, I hope it does change for you. As I tried to note, there are slightly different methods of connection being made, but I’d expect soonish that the desktop apps to be officially retired (to my chagrin, I use the Mac version frequently, just because it’s easy at work not to have to pull out my iPhone). At which point we’ll be using the web interface, or the mobile apps. I’d definitely call in, if you continue to have difficulty.
Not sure if it makes much difference to you, but the only Sonos employees that respond in this forum are the (very few) forum moderators. I suspect they read and collate data for reporting to other teams, but you’re not going to reach anyone from Support here, they aren’t part of the forums. Fortunately, the moderators frequently have been in the telephone support group, and either way, know quite well what they’re talking about, when they get a chance to respond. IMHO, of course.
Great to know. I actually don't normally post on forums and didn't really know what to expect. I'm sure part of me was expecting to hear from others that may have the same issues that I'm having, and get a little troubleshoot assistance.
I suppose it's kind of like going on YouTube when you have a problem and need to fix something... chances are somebody's got the same problem you have.
Finally got through to Sonos support, who decided after all it is a known probllem with Sonos. So after all these months, spending time and money sorting out a NAS, the new app still doesn’t have the basic features of the old app working. Even the old features are still flakey, with a still a lag on loading.
They suggested a work around of using the web app, but can’t use this on the phone, or using the windows app in which my music library does work, but I don’t want to fire my laptop up just to play my music.
It’s now hard to recommend Sonos to my friends, what use to be a good system is now almost unusable, there may be a time when I decide to ditch my expensive Sonos speakers for good for something else.
Yes, unfortunately I agree. I recommended Sonos to several friends years ago and I wouldn’t even consider it now. Don’t get me wrong the sounds is amazing, but they mucked up the accessibility with the phone so bad that I want to sell my system. They took a feature that was ultimately a huge piece that set them far apart from the rest and now...boooo 
