On 6.3.1 Pro version, i noticed a new featture called “smart link”.
To my understanding, smart links are used to send direct links to files to loggedin and authorized users (files must be previouly shared)
I think that the feature (or text) may be confusing to users.
On the same line, they can share direct links (smart links) or share the files (button).
Maybe the text could be changed to "Direct link"
And in the popup, add text sur as "Direct link to a shared objet : the object must be previously shared to users ou groups"