RE: Link preview on facebook auto page post

Not currently. This would require posting the link meta-data with the post.

You may be able to call the Facebook graph API directly from a Self script,

https://developers.facebook.com/docs/graph-api/reference/v2.11/post

Please add this feature request to our Issue Tracker,

https://www.botlibre.com/issuetracker?id=20087140

If you need this feature, we can implement it for you through our Bot Libre for Business Enterprise service, or Bot Libre Diamond.