If you paste a link it should embed the media right in the chat (Gif, mp4, youtube, Vimeo, Soundcloud etc.)
The team has not made a decision on whether to move forward with this feature. We will update when we have new status to share.
Jeff Kozloff commented
To take it a step further, it would be great if a tab of a channel could be hosting the embed. Case in point, manager has a large idea, and it all begins with a video they saw on one of the popular streaming video networks (youtube, Vimeo, etc). We want to make this a source/starting point of the discussion and always available to the channel.
Stephen Kowalski commented
It would also be nice if there was some connection to the SharePoint Videos channels. It would be nice to share videos already uploaded to SharePoint within Teams.
I assume this covers both uploading a video file and sharing a link to youtube
I complete agree.
So when you post a video in chat you can play it there and then. Without having to follow the link