A loot box contains a list of items that have individual drop rates. You can create an instance of a loot box from Assets > Create > Inventool > Items > Loot Box.
Each loot box can have any number of items. The 'Add Item' button will open the Item Finder, allowing you to search and select the item to add. To remove an item, click on it and then click 'Remove'.
Properties
Individual Items
Name
Description
Range
The random range of the amount of the item that can be dropped.
Drop Rate
The drop rate of the item. Changing this value for any item will update the percentages that represent each item's odds of dropping compared to the other items.