It allows for storing assets inside your level package, essential for functioning with the Rocket League Workshop.
For easier management, consider using the Rocket League Map Manager on GitHub to switch between custom maps automatically. Labs_Underpass_P.upk
Ultimate Guide to Custom Maps in Rocket League: Mastering Labs_Underpass_P.upk It allows for storing assets inside your level
When using Park_P instead of Underpass, forgetting to rename the file back can cause you to get a 15-min ban if you join a competitive playlist and Beckwith Park appears. Using Underpass reduces this risk. Labs_Underpass_P.upk