Yes, my products are “Add To Project” and most of the customers I speak with then migrate content from one project to another. The only similarity marketplace products should have in terms of folder structure, is parent folder. That is 1 folder typically named after the product that resides in the content folder - and everything else is placed in there. Epic’s own content doesn’t even follow that either. Otherwise depending on the product type, it isn’t always efficient to use the same folder structure. When I’m making individual asset packs, sure it works fine. But bundles? Absolutely not, for the many reasons outlined above.