Quote - Both Avid and After Effects will import PNG files sequentially and make a clip with a transparent background.  When you output your animation from Poser choose Image Files rather than AVI files.  Poser will output numbered PNG files and you'll end up with a folder with PNG images numbered sequentially.

When you import into Avid or After Effects, you import as a sequence and the system will automatically created a clip using each PNG as a single frame in the sequence.  This clip has a transparent background.

Your problem my be you using a low end editing program that doesn't support Alpha channels.

There is no need to go the greenscreen route in AfterEffects as the transparent clips self key and save a lot of time.  It's especially effective when you use motion blur - no green fringing, the transparency is perfectly preserved.

AfterEffects has a sequence image function? Awesome, seems I need to play with it more. Only tried it in college...

My suggestion for a chroma key was just in case they didn't want to use an image sequence, actually. :)

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.