“Create” is in the left corner beside “Catalog”.

You can find “Audio” underneath “Game Passes”.

The file must be an mp3 or OGG file. Audio files must be less than 7 minutes long and smaller than 20 MB in size.

It’s 20 Robux for 0-10 seconds. It’s 35 Robux for 10-30 seconds. It’s 70 Robux for 30 seconds-2 minutes. It’s 350 Robux for 2-7 minutes.