image
While Mattermost's image expansion works as expected when the URL ends in .gif, .jpg, etc, image-based links that Slack would expand automatically are not expanded by Mattermost.
For example, post links like the following to a Mattermost channel or DM:
http://media.riffsy.com/images/41a79faf658c913d77bfe36b8a231244/raw
http://gph.is/2lQfDuj
http://imgur.com/gallery/83mmP
etc, and note that they do not expand, requiring a user to click on them to view in a new browser tab. It would be nice to have the images auto-expand in-line.
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Thank you everyone for nominating this feature!
Mattermost 5.3 and later expands shortened (e.g. bitly) links for previewable content such as images and YouTube links.