Well I wouldn’t call it a slide show. All that happens is I get a thumbnail of the image that slides down to the bottom of the screen. The list of files still takes up half the width of the screen. What I want is to have the images full screen and as a slide show.
If I press the play button with a file name highlighted all that happens is that Finder restarts.
Plus at first it said that there were no file with a known extension. It wasn’t until I worked out how to add jpg to the file types it recognised in media player that it would even show any images at all.