hi im having trouble with my background slide show. first there is no smooth transition when changing pictures and i've checked ease of access & system for the animation options. also it doesn't change all pictures at the same time i have 4 monitors and it only changes on 1 monitor and then next time it changing on another monitor like it's random but never on all at the same time.

tried all of the steps here to see that it is set to best appearance.
https://www.tenforums.com/tutorials/6377-change-visual-effects-settings-windows-10-a.html