Are you not able to add a unfurl link on mobile or without a setting change? Wanted to add one to match all the other posts on a thread but even if i copy the exact formula used by other users the moment i edit the url (even just the page id since the same website is linked) the desired preview disappears. Used multiple browsers & desktop mode since it honestly gets to me a little when i cant find out how to utilize available features in something.
Removed 1st bracket so below doesnt try to insert a link, final post would/does have it.
URL unfurl="true"]insert link here[/URL]
URL unfurl="true"]insert link here[/URL]