Tray files

Hi, I'm downloading all kinds of cc rn and 3 of them were tray files. i put them directly into the tray file, no sub file . I joined the game and didn't saw the sim in the gallery even though I also pressed cc contained . Maybe I'm looking in the wrong place for the tray file? I tried to do everything ,but nothing seems to work and for addition I play sims 4 on a macbook air ,so Idk if it is the reason why the tray files don't work? thank you.