Collection artwork

Can someone direct me to the instructions for adding missing artwork for collections?
I checked the tmdb and they don’t have them so infuse doesn’t show anything. I found instructions for folder and favourites artwork but none for collections.

I don’t recall if you can add a local image for collections but have you considered joining TMDB and adding a poster where one is missing? That would solve your problem as well as help out the community.

It’s not hard to do and may be even easier than adding one locally.