We ask for the .mml files instead of the .ms2mml files because there is always the possibility of users uploading troll songs that are just rest notes or high pitched notes that will blow people's ears out. We manually review every submission, make sure the mml code is optimized since it would waste space on a Maplestory sheet, create the ms2mml and the mp3 preview. We also check to make sure the user chose the right sheet type so users don't download what they expect a 3K sheet but turns out to be a 10K note sheet. Uploading the mml file is all we need, after we review the code we will upload the .ms2mml file and link it to that green download button. No one can view the post until we review the submission and approve it.