What is Linked Sprite Collections used for?

[LaserDinosaur]

Stupid question but, what exactly is the purpose of Linked Sprite Collections?
 
When I first read of the feature, I was hoping that I could take my two sprite collections and link them together into one atlas, reducing the amount of draw calls. However, it seems like it's maybe meant for linking to various types of the same image, like player.png and player_2x.png, without having to manually manage the files?

Basically I have my main sprite collection and a second sprite collection just for fonts. I'd like to have the main sprite collection link and pull in the data from the font collection, but I don't know if that is what this feature is meant to do. Is this not what it's for?

[unikronsoftware]

Its for linking things like normal maps - where each sprite has a corresponding normal map.