Attach .fla to .swf

Hi.

I’m in the middle of making a flash movie and want to submit it to an animation website like Newgrounds or ABS. I have already submitted one to Newgrounds, but since it has no “play” or “replay” buttons at either end, it’s not very popular. I was wondering if you could help me attach or embed or whatever it is you do to an fla file to an swf file, as fla is the file extension of the preloader I want to embed or attach to my swf file. I don’t want to make the same mistake twice. Can anyone help me?

if you import your swf made in TBS into Flash, can you add a play button and save it in the format you want like .fla?