I'm clearly confused. Now I don't even think I know what a thumbnail is w.r.t. a short. Is it the image show when people browse the videos on my channel? Because in that case can't I just change it?
There are only a limited number of scenes in my shorts. If I make sure that at least one would also work as a thumbnail I'm thinking that I can up load many similar but slightly different versions and hope that YT randomly chooses the right thumbnail for one of them. That is the one that I publish.How will that help me choose the thumbnail on a short?