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Adds one or more of the specified item to an item container. The ID of the item is case-sensitive and should match the ID assigned to it in the Item Editor (e.g. “ITEM_0001”). The item(s) will be placed into the first open slot(s) of the container.
add_item_to_container(entity, item_id, count)
add_item_to_container(self, "ITEM_0001", 1)