Using video with a transparent background in Keynote

For a theater production I am creating a slide show. On some of the slides I would like to import some moving snow (created with a particle generator in Motion). I would like the snow to appear over an existing image slide. I exported the motion file as a quicktime .mov file with an alpha channel. Is there any way to do this?
Message was edited by: Finn Campman

You could do it with an image sequence but AFAIK there’s no support for alpha channels in video.

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