Facebook, twitter etc all look for an image URL in the og tags. Currently, if you share a page which is using External Images, it does not find the correct featured image.
Update External Images plugin to set the og tags correctly. Specifically, set og:image tag.
January 18, 2018 @ 4:38 pm
og:image tag has been added to the
area in the dev version. This means social media will now correctly pick up the external image from your pages.January 22, 2018 @ 12:55 pm
Released v1.76