Sonos no longer recognizing folder.jpg for cover art?

Using a Raspberry Pi here.

from /etc/smb.conf

[global]

# enable v1 authentication for Sonos access
ntlm auth=yes

# enable v2 authentication
#min protocol = SMB2
#protocol = SMB2

[music]                                                                                 
Comment = Pi shared folder                                                              
Path = /mnt/ssd-music                                                                   
Browseable = yes                                                                        
Writeable = Yes                                                                         
only guest = no                                                                         
create mask = 0555                                                                      
directory mask = 0555                                                                   
Public = yes                                                                            
Guest ok = yes 

How is this helping us to get back our cover art?

Up a few posts what connection settings were being used was asked for.

I can’t see it having any value to you, but maybe Sonos Support or the other poster may.

This thread began 5 days ago. That must mean the problem of the disappearing cover art is at least a week old. Since then 8 people have sent in their diagnostics:
Stanley_4
beynym
Vegeta_UK
Erland Sommarskog
jkpalmer52
only_sleeping
Luc45
jreddaway
Still no reaction from Sonos, though. Question for those of Sonos who are following this: would it be possible to look at our diagnostics and let us know how Sonos is getting on with solving this problem?

Have been talking to Dutch Support. They confirmed that the new SMB3 protocol (introduced in 13.4) was the culprit. Sonos is working on a solution, but couldn't give a ETA for it.

Interesting. There was no mention of extended SMB support in the release notes, perhaps there was some last minute knowledge of a potential issue that kept them from exposing/raising hopes?

Have you tested with SMB v2 or even going back to SMB v1 to see if this issue is pervasive across all versions?

I'd like to do that but I've got a Western Digital My Cloud Home that can not be configured. So testing is not possible. The only thing I noticed was that cover art does show in the controller apps from mp3's or flac's that have the image embedded.

Odd. I have been able to mess with the settings on my MyCloud NAS before, but am currently not at home due to the holiday here in the US to do any testing myself. 

Apparently a MyCloud NAS is something quite different from a MyCloud Home NAS. If I'm mistaking, please show me how to configure my MyCloud Home. Always eager to learn...

As I said, I’m not at home to check, so it will need to wait till next week, and, as you say, my device is several years old, and is certainly possible that it has a different interface than yours. Unfortunately, in my opinion, Western Digital doesn’t do a tremendous job of differentiation when naming their devices, so it’s not always evident to a layman such as myself which interface is available for which device. 
 

That being said, when I get home on Monday I’ll definitely take a look.