This board item is currently supported only in the Web SDK 2.0.
Preview items render a preview of the content a URL points to.
When users copy-paste to a board a URL pointing to a web page, the preview item renders the Open Graph metadata of the URL target as rich content.
It's the same mechanism that enables displaying link previews on social media sites like Facebook, or messaging apps like iMessage.
Figure 1. Preview item.
Updated about 2 months ago