put Original mp3 and replace w/ m4a, didnt work, did OG .mp3 and replace .m4a, still didnt work. pls help
Mp3tag is not a converter. It is for adding metadata info like Artist, Album, and Title details and Album cover art to your existing audio files.
In addition to @MotleyG: Mp3tag does not alter the audio content of your files in any way. It simply helps you manage the metadata associated with your music.