Audio import

Hi I'm trying to develop for Meta Horizon Desktop, but I can't import my own audio which is important to my game is it's and obby rhythm game.  The menu options in the help show audio import, but the desktop editor and web don't have audio import as an option.  Please help!! 

https://developers.meta.com/horizon-worlds/learn/documentation/desktop-editor/assets/creating-importing-viewing-and-spawning-assets