Does anyone know how I can actually upload mp3 demos for some feedback??
I would use dropbox or google drive to upload the files first and then provide a link on this forum. I've seen also people using soundcloud and youtube for that. I know that on Youtube you can set your movies to "not public" (or something like that) mode so that the movie will be available only for you and for people who will receive the link to it. Unless it is not your concern to give your music to the public, then just use Youtube, Soundcloud, Bancamp, Reverbnations etc. Good Luck!