Navigation Smart Links?

Hi

I tried to find some information on the Smart Nav Links in UE4.
I placed a NavLinkProxy in the world, set the Smart Link options and added a debug print to “Event Receive Smart Link Reached” event.
However no matter what I do the AI does not use this “Link” at all and the event is never fired.
Also the relative start and relative end configured for the smart link don’t even show up in the world - not even in nav debug mode…

TL;DR: What the heck can we do with Smart Links and how do we do it?

(Maybe MieszkoZ can clear this up a bit)