When selecting Unreal Engine as the export option in ActorCore and then importing in Unreal, how do I get the character to use Epic UE4 Mannequin Skeleton so that I can make use of the tons of animations available on the Unreal Marketplace?

Also, how can I get Reallusion marketplace animations (Like City Life) to work on the Epic UE4 Mannequin so that characters from the Unreal marketplace can use reallusion animations?

I haven't found clear instructions/tutorials on how to do either of the above in Unreal Engine 5.1.