The Image Block and Image Block Element now correctly support using either an image_url string or a slack_file object. The latter is particularly useful when wanting to display an image that is only uploaded within Slack, and not available via a public URL.
Also, the rich_text_quote Block Element had a missing border property. We have addressed this deficiency. Hooray!
aea11d00 Add slack_file object to image block/element types (#1783)
20899b01 Add missing border property to rich_text_quote block element (#1753)
Fetched April 3, 2026