Convenience. Adding more than one item at a time to sets.

[Humdinger504]

When completing sets and having to add items one by one is a tedious process. It's 2019 AND y'all made us upgrade our phones for this game. We should be able to add more than one item, if not all, at one time. Why can't we add more than one item at a time. Why do we have to add 20, 50 or 100+ items to a set individually, one at a time and one by one?