Google Drive not OneBoxing

[JammyDodger]

Is there anything in the Onebox guide that can help?

Create rich link previews with Onebox

Onebox converts your web links into useful preview excerpts that help inform readers about the target before they click through. To create a onebox, simply paste any link into a post on a line by itself, like so: https://example.com/interesting-article Which results in … In addition to supporting general oEmbed and OpenGraph tags, Onebox has many custom rules for extremely popular sites including Wikipedia, Twitter, Amazon, Youtube, Soundcloud, Stack Overflow, Github and more. Try it o…

There are a couple of trouble-shotting tips, and some info on the white and blacklists. Hopefully something in there can provide a clue while you wait for more replies.