The entire internet is filled with going the other way but what if I already bought a character in the UE4 market place and I want to use skin gen to make this absolutely amazing piece of super fake plastic look more human? For example, the Katanami Shadow character is everything I have been looking for in a character and the Reallusion marketplaces have nothing that comes close to the quality of the clothing this character has... but this character looks like a doll. I want to import her into CC3 and give her face the love and attention that only CC3 can do.

To the best of my knowledge, though, that is impossible even via XChange. Am I right in saying that flow of assets is definitely one way from CC to UE4 and can NOT go the other way around?