Not all folders show thumbnails

My system is Windows 10. In my Music collection I have an image file titled 'folder.jpg' in every folder, which serves as the thumbnail image for that folder in Windows explorer. In Directory Opus it only shows thumbnails for some folders, but not all.

Why is this?

I had the same issue on my laptop (which is Windows 11) and the apparent solution there was to copy all the 'folder.jpg' files to the same folders and rename the files 'coverartist.jpg'. I now can get thumbnails across the board on the laptop, but doing this changed nothing on my Windows 10 PC.

I can get all the thumbnails to show up when I check the Windows folder option, but I prefer the full thumbnail look when the Windows folder option is disabled. I can't detect anything structurally wrong with my setup. Some folders respond the right way, while others don't.

Thanks for any help.

Are those directories on a (network?) drive that's quite slow to respond, or slow if multiple files are read in parallel?

Folder thumbnail generation may be cancelled if it takes a long time, although it should not usually affect most situations.

It might also be worth checking what happens if you go to the real folder, instead of via the library.

If the library is pointing to a OneDrive folder (which Microsoft have been making happen with Windows 11 updates recently, without asking), that could also explain things; the folder.jpg files need to be stored locally, not only flagged as "offline; only available via the cloud" or similar. They can be in OneDrive but need to exist locally, not just as placeholders.

The drive is local. The real folder(s) look normal. No issues there.

Here are the same folders that appear blank in Directory Opus, but show proper thumbnails in explorer:

On my laptop I accessed files over the network and the thumbnails were fine.

So it's only going wrong when viewed via the library?

If you right-click the "Music" Library and choose Properties, which folder path(s) are in it?

Edit: Also check that the folder.jpg files are actually jpeg images and not something else with the wrong extension. (Some types should still work with the wrong extension, but not necessarily all or the same ones that might work in Explorer.)

The folder paths are connected to my User/Music folder. It's not over a network.

All of the folder.jpg images are proper jpeg files.

One interesting thing is I have a separate, large collection of Library Music that I recently re-tagged and organized. It has the same structure with 'folder.jpg' images in every folder and the thumbnails there are flawless in Directory Opus.

Fwiw, the Library Music collection is on an external drive.

I once had issues with some music folders artworks.
Can't really remember if it was exactly not showing the artwork, but the issue was at least inconsistency in the way the artwork is rendered : e.g. the difference between your last screenshot where you see a folder with artwork "on it", and your first screenshot where the first image lies into a CD case.

What I found in the end, was that CD case display was 100% sure when there was a coverart.png file in the folder.
So I ended up making some buttons to extract art from music files (I think the method was different for mp3 and flac) and then ensure I had a converart.png file in it.

I figured out what my issue was and it was pretty dumb. The files named 'albumartist' should've said 'albumart' instead. It's now fixed.

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