1. In the Compose Box, attach the image you want to create a link preview for. For more information on attaching images, please click here.
2. Hover over the image and select the paperclip icon displayed to the top left of the image.
3. Add the link you want to create a link preview of.
4. Click Generate.
5. The link preview will then be created including the image you attached originally. You can still edit the title, URL and text for that link preview.