Sometimes, when you try to share a link to your Facebook page, Facebook doesn’t show the link preview, it just displays site URL, here is how you can fix this.
Fix Facebook doesn’t show link Preview
1. Visit Facebook Sharing debugger page,
2. Paste the link, for which the Preview wasn’t shown and click ‘Debug’.
3. Ignore the warnings and click ‘Scrape Again’, now debugger tool will show the link preview at the bottom of the page correctly.
4. Go to your Facebook page and share the link, Preview will now work and you can publish the post without any issues.