Supplied variable for Set Wallpaper

[whenevere]

Currently, the "Set Wallpaper" action does not have a supplied variable.

I think there should be a supplied variable to capture and save the path of the wallpaper image.

Why? To be able to remember and change back to the previous wallpaper. I can think of many other uses and manipulations that can be done on the wallpaper if there is variable for it.

Thanks.