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"Slack" can unfurl links as videos, but some services can and some cannot.

Vimeo(https://vimeo.com/) can unfurl links as videos in Slack.

TED(https://www.ted.com/talks) cannot unfurl links as videos in Slack.

Their's HTML have oembed links as <link rel="alternate" type="application/json+oembed" href="https://example.com/...
And They have embed video player.

reference: https://oembed.com/

What is their's difference?

t.kajiri
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1 Answers1

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According to Slack support:

Unfurling of inline videos is made possible by allowlisting specific partner domains. Currently, there is only a small number of providers which unfurl this way in Slack, such as widely adopted services like YouTube, Loom and Vimeo. Each has been added on a case by case basis. We don't have any immediate plans to add further video unfurls such as this

rectalogic
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  • So it's basically handpicked by slack. It's funny loom screenshots don't unfurl even though their videos do (the URL pattern is different, so I guess they look at more than just the domain itself). – gdvalderrama May 09 '22 at 12:46