Trouble Uploading Flash MX 2004 published .mov to youtube

I’m trying to upload a quicktime movie that was created by Flash MX 2004 up to youtube, but they’re saying it is an invalid file type. Their site clearly says they accept mov, so I’m not sure what the problem could be. I suspect it has to do with the fact that I used Flash to publish the .mov, but not really sure. Anyone have any experience with this? Any possible solutions?

Lee