You can directly create or import meshes and textures inside your level package.
Find your Rocket League map folder, usually located here: Documents\My Games\RocketLeague\TAGame\CookedPCConsole\mods Labs_Underpass_P.upk
No, you can ignore the universal Mods.upk file for this method. You can directly create or import meshes and
Take the custom .upk file you downloaded and rename it exactly: Labs_Underpass_P.upk . Labs_Underpass_P.upk
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