I am making a prototype of a game idea centered around using an inventory of crates that are opened to perform game tasks and one type of crate will be dropping into the inventory over time; money crates which need to be opened to get the money. Most of the inventory examples I have seen assume you will be 'picking up' items, I was wondering how can I drop an item into an inventory on a timer instead of upon some player action. The inventory needs to be drag and drop for my mechanic idea to work.
I can elaborate on my game idea if needed to help me out.