So when you are updating one of your binders, or part of your collection. Instead of doing a full import that would just add X number of all the cards in the import text, the system would see the new import has say 4 of Card X, and in your collection you have 3 of card X already. So it would add the different and show you as having 4 in your collection instead of 7. This way we wouldn’t have to delete an entire folder just to update it with accurate information.