When I use the Slack Power-Up to post a Trello card to a channel in Slack, the resulting message includes a broken link instead of a preview image (when a cover image has been selected for the card). Here's an example of a card in Trello:
And here's how it appears in Slack. Note the broken image link on the right:
This integration last worked properly with an image preview in Slack on 29 November, if that helps narrow down when a code change might have caused it.
Thank you for taking a look!
