It allows for storing assets inside your level package, essential for functioning with the Rocket League Workshop.
No, you can ignore the universal Mods.upk file for this method. Labs_Underpass_P.upk
This guide will walk you through setting up, testing, and managing custom maps using the Labs_Underpass_P.upk file method. What is Labs_Underpass_P.upk? It allows for storing assets inside your level
Ultimate Guide to Custom Maps in Rocket League: Mastering Labs_Underpass_P.upk Labs_Underpass_P.upk