First Time Downloading MP3 Help

I like to download a sound (mp3) the I find in the Flash Kit sound loops, I have this sound in my WinZip and then I unzipped and send it to my Flash MX files, and then import or import to library and I get a error:
“One o more files were not imported…”
If I go to files>open this sound open like a movie
“Type Flash Movie”
How can I place this sound in a layer of my movie?
Thank you.

ive had the ame problem I wantd toimport a sod and t was curupt or oething i assumed it was currupt try and find another suitable sound file and use that I dont kno if there is any other way