I am a noob, trying to become more familiar with making apps and i created a test project for myself in which i am trying to make an app that changes the background to a random image in a specific folder each hour of the day.

This seemed like it should not be too difficult but I am running into some issues. I am currently messing around in an adb shell with gsettings and also trying dbus-send and gdbus with org.freedesktop.Accounts.User BackgroundFile but when i try to Set the value, it does not update since i don't have write ability. I am assuming this is due to sandboxing. Is there a recommended way of interacting with the system to change the background programatically?

I tried looking through the documentation but I can't find anything that really describes any of this.