I came across this comment in a post. Summit only loads it as an image with the play icon on it. Tapping on the image (probably the video thumbnail preview) opens the image in a gallery view but still doesn’t play the video itself.
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It seems to depend on the instance too, like it works fine when viewed on feddit
It looks like the image in the original comment is proxied by lemmy.zip rather than directly fetched from lemmy.world
I know lemmy.zip likes to reencode files as either avif or apng, which are newer formats that some clients can’t handle. Whenever I have a problem opening an image it’s always that instance.