How do I assign a picture or thumbnail to folders?

[Diamond Dog]

I had an older streamer that I upgraded to an Nvidia Shield

I watch concert videos. So I have a folder for an Artist and that folder will be filled with multiple sub folders with different concerts. I did it this way because for artwork to show up on my previous streamer, I would included a …jpg named folder.jpg and the artwork for that video would show up. I would also do one for the Artist folder so that there would be a picture of the artist.

Some videos are Blu Ray rips so its nice to have the 1 sub folders contain the multiple folders from a Blu Ray rip

How can I make a folder show up with manually selected artwork. I already tried naming the jpg the same as the artist folder and also tried naming the jpg, folder.jpg and it didnt work.

I don't need all the movie information that other players provide. Just a simple picture or thumbnail I assign to the folder that contains it