I've created an animation in 3dsMax that I'm planning to use as an overlay. I've imported it into PPro and the alpha channel works just great. I can slot stuff behind it and everything looks hunky dory. But I've had to play - cut it into bits and reassemble again - and so I wish to export it and reimport it later. However when I try this I lose the alpha channel. Is there a way for me to export the edited version complete with the alpha channel from PPro?