You have to convert the audio to ogg format. It doesn't work if you only rename a file to .ogg. If you know for sure that the audio is in Ogg Vorbis format, it might be too long or something.
Just changed the file name from "The last ever D'n'B night at bagleys featuring Skibbadee, Eksman" to "Junglist" and wahey! Tunes are pumpin' as I am driftin'. Cheers matey!
The file is 58mb from 68mb and it is a hour long DnB set