Having trouble with music/sound effect uploading

I know that it has to be hosted online but i tried using vocaroo and it said it wasnt directed to a mp3 so i was wondering if anyone had a website that they used or if my file is just messed up or something

There are several free websites that can covert your file into an mp3, I’de just google it because I can’t remember what site I used

what file type are you trying to convert to mp3?