In my blog entry I am trying to learn how to use Twitter Cards. All is fine, except that the image I upload is not shown by Twitter. To see the problem, use regular non-mobile browser.
This is my blog entry: https://blog.nopunen.fi/twitter-cards-twitter-kortit/
This is a tweet about it: https://twitter.com/msrjksk/status/988114544403861505
casper (worldcasper2) Version 2.1.10
Same problem seems to be with posts at ghost.org as well, for example: