My blog is at tcmaker.org/blog. When I create a new post, I paste a link to the blog site on a variety of facebook pages. I then am allowed to choose between 3 thumbnails to display or I can choose no thumbnail.
No matter how many photos there are in my new posts, the SAME 3 THUMBNAILS are offered every time. This gives the appearance that I have no new pics or that I am just writing the same thing! Often, 2 out of 3 thumbnails are not even relevant to my post!
How do I get wordpress to use only jpgs from my current post for the thumbnails?