This extension can help you to change the device wallpaper automatically in the background.
You can choose assets or downloaded images to set wallpaper. and the minimum time duration is 1 minute and the system will be optimized the time duration. and maybe it will be some delay. and after the device reboots, it will start automatically. when the device’s battery is low, then it will automatically stop. and when the battery is ok then, this will start again. and you can choose the wallpaper mode only for the lock screen or the home screen.
This extension was tested on these three platforms – App Inventor, Kodular, and Niotron. hopefully, it will work on all other platforms.
Demo App Block :