From: "Jim Curtis" <AE-List@media-motion.tv>
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Subject: Re: [AE] Playing Back Video with Transparent BG
In-Reply-To: <list-6413763@media-motion.tv>
Date: Sun, 4 Mar 2018 10:50:02 -0600
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References: <list-6413763@media-motion.tv>
To: After Effects Mail List <AE-List@media-motion.tv>
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Just to toss in a monkey wrench, what you=E2=80=99re seeing on =
Shutterstock may be GIFs, which support and will play showing =
transparency.

You can play GIFs in most browsers.  Just drag them to an empty page.