How do I export WebM with transparent background/alpha?

Explorer ,
May 01, 2021 May 01, 2021

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I'm using Premiere 15.1. I want to replace an animated gif that has a transparent backgound on a website with a video file with a transparent backgound. The video is a rendered product demo animation, about 15 seconds long built on a 600x300px sequence. I can export it as a PNG image sequence and the backgound is transparent, and I can export as prores 4444 with alpha and it has a transparent background. How can I get a WebM witha transparent background? I have tried this https://exchange.adobe.com/creativecloud.details.11631.webm.html but can't get it work, no matter what option I select at export it still has black backgroud. Any way to do it as an MP4 or H264? Any other way to make it work as webM? Any thrid party tool that might work?

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