Oh, yes, all these guidelines are with me -I'm truing to upload MP3 with video/audio option, of course. But the real problem is I can upload audio to the media library from admin, but not from the AddOn.
For the URL, just try this:
http://www.futuremusic-es.com/novation-launchpad-pro-y-dark-techno-jam-de-alexander-franz/
Thanks!