Chroma + Artist Slideshow

Hi

I read that Chroma is compatible with Artist Slideshow, is there anything special to activate that?
I created a lokal folder with fanarts like described in several youtube videos or forums and configured Artist Slideshow like that (use lokal folder first) but for artist I already own fanarts nothing appears.
I’m sure I miss something but don’t see now what… Perhaps also another function must be deactivated or so…

Thanks for any advice