Hi C,
Thanks for reaching out and thank you for using Crio Pro WordPress theme!
That content link preview functionality is normally tied to your SEO plugin. I see you’re using the All-In-One Seo plugin on your site. This particular plugin has documented issues for the same problem of the blog featured image not showing in content previews. I found this article that you may help you to correct this issue within the plugin settings.
The functionality you seek seems to work perfectly with SEO plugins like our BoldGrid SEO or Yoast SEO. If you chose to install one of these once activated you can configure the new SEO plugin to display featured images in your linked content previews. Just be sure to only run one SEO plugin at a time.
I hope this helps. Please reach back out if you have any other questions for us.