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How to change wallpaper?

Is there a way to change your mobile wallpaper within your Unreal Engine app?

I theory UE4 is modular enough that allows you to call custom Java code. Thus, everything you can do with Java, you can do it with an Unreal (and for some actions you need to ask permissions to the user).
As far as I am aware, there is not built-in function that can do what you are asking, but if it is possible to change the wallpaper with Java, then you can create some ad-hoc code for doing that.

Thanks, that’s what I figured.