A friend sent me an audio file that was recorded with his audio recorder app on his IPhone. He uploaded it to a Google drive but when I downloaded it the file type is just listed as "file". This didn't happen for my other friend who did the same thing and her file is listed as M4A which works. I don't know how to change it or how to fix it, and online converters won't convert it because they can't recognize the file type. Please help!