Album Art display inconsistent in "My Sonos" screen?

My point is, he may be factually correct in what he stated, but those facts are not an “answer” to the question posed.  As the dilemma still exists and does not appear to be slowness (cache related) - as it will stay that way forever on the iPhone unless/until I either open the PC app and go to favorites therein, or remove/re-add the music in question.  Nor does it explain why the same album art shows on some lists within the Sonos app, but not others (the issue seeming to be primarily with the main favorites screen).   I understood the “answer” tag to mean the issue has been resolved, and didn’t want people reading this thread to think the issue no longer existed.  

Who marked my reply as an Answer anyway?

I see the issue happening with both the album (large size art), as well as the small art (such as the songs) - both different sections of the favorites screen.   Incidentally, the issue occurs only with particular albums/songs, even after re-downloaded, etc.   So perhaps there is some sort of error in the graphic/code on the Amazon Music side (which is where the music in question comes from).  Although it seems odd that it will work initially, and then stop after a period of time, as well as appear in some places but not others (same size).

And as far as I can tell, SonosNet looks fairly clean (colors are as represented - green and yellow where indicated)):

It appears that the moderators have removed the ‘answered’ tag. Although honestly, I suspect most people don’t pay attention to that flag, and just look at any unread responses in a thread. At least, that’s the way I treat the forum. 

Odd artwork behavior is usually related to communication issues. As a track is added to a list, a request is entered for its artwork, but there is a time limit. Without a time limit the whole system could stall if there are excessive delays. If there is a timeout, default artwork will be inserted. The communication issues are likely random. Therefore the timeouts will be random and the insertion of default artwork will be random too. Successive runs with the same tracks might result in different artwork populations.

If it was random communications issues, wouldn’t it impact different art/music files?   It seems to be the same culprits (same music files) that don’t populate (it doesn’t happen to random music files).  Also, it still seems odd that the same problematic album art does populate on my phone the instant I open favorites on the Sonos PC app (what is this weird connection between the PC app and iPhone Sonos App)?.   And, why would the album art show up in some places on the iPhone (but not other places), for the same music file? 

On a hunch, make sure that you are in a location with a solid wireless connection for the phone, then change the playlist. I’m not sure exactly what I would want to do, but loading all tracks into the Queue, then saving the Queue using a new name would be a start, Is the artwork under the new name correct? Another approach would be to load the playlist into the Queue, make a small edit at the top of the Queue, and save the Queue as the same or new Playlist.

Shortly after these trials submit a diagnostic if things don’t work out. Post the diagnostic confirmation number here and SONOS Staff can check to see if any issues are logged.

I wonder if there is some share/permissions issue on my PC that could slow this down - and thus cause the caching issue and thus art to not show?   I reinstalled the Sonos PC App, and re-setup my music library link on the PC app.  I noticed that I could not set up the same link on the iPhone Sonos app manually without first doing it on the PC App (it pulled in the music library path ONLY after the Sonos PC app music library path was set up).   If I tried to do it manually on the iPhone, it would say it couldn’t find my computer name (even though I was using the exact same path that it would automatically put in there (apparently pulled from the PC app).   So clearly there is some connection with the Sonos PC app and the iphone App.  And I believe that connection is somehow impacting the art showing.   If I didn’t use the Sonos PC app to set up my music library, I would not have been able to set up the music library on my iPhone Sonos App at all (which doesn't seem to make sense).   Any insight there?

Additionally, is it normal to page down on the iPhone Sonos app and see album art populate as you go ?  In other words - it isn’t already there, but only appears when you are on that part of the screen. It seems to me, that it should be faster than that, and not just populate as you bring the file into view.  True/false?

The PC controller can deal with file permissions for tracks stored on the PC, the phone cannot change permissions for PC files. (If the phone could change file permissions on the PC, there would essentially be no security on the PC)

The controllers don’t store any music, artwork, or the library index. Artwork is fetched from the library as needed. There is a relatively small artwork cache, we do not know exactly how large and the size will likely change from release to release. If the required artwork is in the cache, scrolling will be smooth and successfully fetched artwork will be displayed promptly. Track meta data (Track title, Album name, Artist, etc.) is stored in the index and can usually be fetched promptly from a player. Artwork is stored only in the library. If artwork is required, the player must fetch the artwork from the library and send the artwork to the controller. Artwork fetches are scheduled, music has priority. And as I mentioned in a previous post there is a timeout for artwork fetch attempts. I have noticed that artwork does not always populate in order from the list top to list bottom.

There are a number of asynchronous real time tasks running on the controller, players, and computer. Music data must have the highest priority, artwork fetch has the lowest priority and artwork fetch can sometimes be out of order.