Importing flv and mp3 files is missing

I installed Asset, Asset Import, and Asset Bonus modules, and configured them per the documentation. I checked in Administer > Site Configuration > Asset > Asset Bonus, and I see that four players are found including swfheader and swfobject. I copied jpg, mp3, and flv files into the import directory. When I go to Administer > Content Management > Asset Import, I see only the jpg file as available to import. What am I missing to get the mp3 and flv files to show up in the asset import screen?