Emby not downloading cover arts

[Nabukodonosor 17]

I have a Concerts folder with several concerts and some movies related to music. So, my library is of the Mixed content type. I don't know, maybe that's wrong, maybe it should be of Movies type. But I don't think it matters. I'm interested to know how come when I created the library it didn't download any of the covers? I had to get and insert them manualy. You can see one of them on my screenshot. And my settings. I thought maybe the cover is not available on FanArt, but it is:

https://fanart.tv/movie/11401/metallica-some-kind-of-monster/?section=poster

Why didn't Emby get it? It did get the logo and backdrop. But not the cover. And this was the case for my whole library.