Have you tried reducing the JPEG quality in the publish settings and clicking the "compress" option.
I doubt you'll be able to compress it much without removing content that you can load dynamically. If you search Google using "Flash compress swf" you'll find some info, including a resource that says it can compress an swf up to 70%, but that is still not going to get you your 50K.
It would be good to know what elements you're using in your movie and how you animate them : Vector images, bitmaps, sounds, motion tweens, shape tweens, stop frame etc ?
Oh and also what Flash version you're using and what version of the flash player you're going to export in because the performances are different too!
Here are some tips for inside your movie:
- as earlier said, you can set up the compression level for the bitmaps within Flash. If you can compress all your images with a proper bitmap software like Photoshop before you import them into Flash it's even better
- if you are using vector images, try to reduce the number of their points using the "smooth" tool (at the buttom of the tool panel once the black arrow is selected)
- regarding animations, motion and shape tweens are less "heavy" because they require less keyframes. If you can remove some keyframes and simplify your animation, that would obviously help
- use symbols. If you have the same object repeated several times, convert it into a symbol so that you are in fact using instances/duplications of the same symbol.
- not sure if you have sounds but if you do, you can also try to change the export settings for them
they are probably other things but these ones are the ones I remember off the top of my head!
i done my artwork in photoshop and saved as a web resolution 72dpi, the stage is only 160 x 620pixels
then i have a few layers with timelines only lasting for about 10seconds, space invaders flying behind text,
no sound or music
i tried exporting as a movie and then importing the movie into a new flash stage and then resave it which it did bring down to 52k but they cant see it when they load it onto there website, im just lost dont know how to compress it.
Dpi is for printing, try optimizing your images to smallest visually acceptable kb size before importing into Flash.
http://webopt.com/ or similar.
I believe Photoshop also has a native image opitmizer. I hear not as good as the above though, or other third party image optimizers.