That social preview / (Twitter card summary) is one issue.

The second issue .... I am requesting to be able to do an SN Post, and for the link use a URL for a .jpg|.jpeg|.png, and that's all I need. SN will render that image when someone views that post.

This is in contrast to me having to do the SN Post as a Discussion post, and then include markdown to get an image displayed.

I see there is already an Issue in Github for this, issue #9