How can I have my Twitter card expanded by default?

Question

This tweet is expanded by default in this timeline.

My tweet here is not expanded by default in my timeline. (The Twitter card validator does not show any errors for my tweet.)

How can I have my Twitter cards expanded by default as well?

Answer 1

The difference between the two is that the expanded one includes an image uploaded to Twitter.

Both might have links to webpages with valid Twitter card meta data, but when a tweet includes an image uploaded to pic.twitter.com (and not just to any image hosting) then it will show a portion of that image in the timeline.