Current questions and answers regarding the map editor.

In the Map Properties Tree, find the line "Loading Screen Sound," click "New," enter the name in English, and click "OK." In the window that appears, select the sound file (wav) from the "Complete" folder of your game in "Source File." Set "Is 3d" to "false." Then, hover over the resource in the file tree (on the left in the new window), right-click, and select "Export." Finally, click "OK."

You can do the same for any other sounds (New => Src File, Export => OK). Creating animations is even simpler.