Creating a separate alpha channel file in AE

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i have created short (<3 seconds) video comprised of 2 layers. each layer filmed green screen, , used keylight in after effects cc create transparent background. ultimate objective use clip create transition use in proshow producer, described in link http://www.youtube.com/watch?v=qg74os8y2wu.  this, need main video file, , second file containing alpha channel. ideas how this?

 

i have used adobe media encoder output flv, , told encode alpha channel, suggested, 1 file (the main video). how alpha file?

 

i using ae cc. discussions have  been able find on subject several years old , refer apparently changed interface.

choose alpha channels menu in output module settings dialog box.



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