Are you sure your uploading mp3's, if you upload mp4, wma's or any other format they will not display in the media library
When, I put mp3, he(it) does not appear in the playlist
You mean they do not appear in the media library? You must drag the mp3's from the media library to the playlist
It seems v3 automatically updates the media library, however if you do not see your mp3's you should try to click on the "update media library", although I think you indicated you already did that You say "I put in in mp3 cc-ftpd,", you mean your uploading using FTP?