Im trying to create animations for use in sprite sheets for xna but am having some problems with exporting png seqeunces from flash with alpha.

I know that if everything is on the main timeline then using the export as png seqeunce with alpha works fine, but when there are movieclip symbols on the main timeline, which themselves are animations, the movie symbols simply remain at their first frames on export.

Is it possible to do what I am trying to do, using movieclip symbol animations on the main timeline and export with the alpha of the symbol intact and obviously playing.