I want cahnge the wallpaper but in Ambient settings but I can't activate the tab "activate effects" to do it, perhaps this problem will be resolve changinf some config file manually?
Thank you for the help.

Pick a directory instead of a wallpaper and Ambient will automatically switch between images found in the directory.

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Thank you for your answer, it works, I didn't that it was so easy, the problem to work with several OS, every works of different way but with MorphOS is more easy, again thank you.