I think Camtasia can also create an html page with an object tag to play the movie. I would just copy this and paste it into an html content instance using the html view in the editor, you may need to adjust paths to reflect where you upload the .flv and .swf files.
I'm no Flash guru though, so others may have better advice. I typically just upload to YouTube and then use the embed code they provide, that way they handle serving the video which tends to be large files so it is nice to offload the storage and bandwidth and work of serving the files to them.
Hope it helps,