You will have two options available to you, either via your favourite SFTP client (i.e. FileZilla - which is a free SFTP client) - or, you can upload your MP3's via a web based form, which is included in your Radio’s cPanel as a function.
Download Filezilla here:
PLEASE NOTE ONLY SFTP CAN BE USED FTP HAS BEEN DISCONTINUED.
SFTP Port for Enterprise: 35788
eg. of File Zilla Settings:
REMEMBER TO CLICK THE "Reload The Playlist" BUTTON.
Don't Create NEW Folders (Playlists) with File-Zilla SFTP, You need to create playlists with the radio panel and then SFTP to them and then click "Reload The Playlist" button on the radio panel at the selected playlist.
Short Video / How to Load MP3 files to your playlist on your panel: