I run a windows version and a linux version of Asset, have been for years, the only thing that escapes me is how to get upstream art to work.

I would like my own version of upstream art for albumartist and composer. I get that it uses the first image found but I do not get how I can change that. There seems to be no folder upstreamartimages
the folderstrucure is
\Music\
\Music\Bob Dylan\
\Music\Bob Dylan\Bob Dylan - 1962 - Live at the Gaslight 1962
\Music\Bob Dylan\Bob Dylan - 1963 - The Freewheelin' Bob Dylan
etc..
where do I place the Bob Dylan.png (as the artist image, not album art) file in this example?