There's not currently a web interface available for uploading content. You can use sftp or Windows File Sharing / Samba with your server to transfer files. Alternatively, if you have a server that contains this content, you could change the storage location to point to a shared directory on this server.
The playback URL will be
http://[Server IP]:1935/vod/mp4:[mp4 Filename]/playlist.m3u8.