How does the Add Model work?

You see im pretty confused on how this works,to the point i made request's to make the voice of a character i like,but sadly it doesnt work since no one here cares lol,so i can anyone explane how does the Model files URL work? do i need to put a google drive link into this,and also how should the file look like? a .Zip file with the voice of the character i like? if so let me know.