Image thumbnail not showing in Facebook post

I published a form which has an image and copied the direct link address.  I then pasted this onto my facebook page.  There is no image and no area below where in the past I have seen where I can select to add an image.  Where did I go wrong.

This is a duplicate thread. Please refer to this thread (https://www.jotform.com/answers/899300) and wait for the reply of my colleague.

Thank you.