Module and folder sync issue in DNG
One answer
There is a concept called "module artifact" in RDNG, and it's the representation of a "base artifact" in a module. While a module is a collection of "module artifacts", the underlying "base artifacts" need to reside in some kind of structure, and that is "folder". Before the introduction of module in RDNG, Collection is the concept of a "collection" of (base) artifacts.