Motorola V878

well i had this phone for about 2 months now and i kept on trying to load mp3 and wav files onto my phone, however it was a failed attempt... i know this phone could support mp3 and wav... and i tried almost everything.. do i need to download an extra software? or is there a way that i dont know about? respond to this or email me please its urgent hahaha i could only upload mid files which are basically polyphonic. respond asap please thanks.