This SONOS update is a disaster! The dreaded (913) error prevails in all conditions especially in the error explanation which advises that the SMB1 protocol is no longer supported and the user should update to SMB2 or 3.
Moreover, the same (913) error occurs when you have your music library located on your local C: drive or any other non-networked drive. Be it a USB external drive on your laptop or an additional hard drive inside your PC. The same of course applies to hosting your data on a NAS, which in my case is a fairly sophisticated 6 bay RAID 5 array, and for that matter my little 2Tb external USB2 drive.
The new update I downloaded today, and installed on my workstation and (as a test, on my stand alone PC) immediately displayed the (913) error. I updated the SMB to v2 and again v3 with no effect. The folder shares are correctly configured and work flawlesly for other applications. I shared and configured a new folder in the same directory structure as the SONOS program which also also faults to the error message.
Sonos… you have a problem with this update. The problem persists in current versions of SMB and properly confiured sharing.
When are you making available a fix, not a work around!
Graham