With the Items tab being opened press the Modify button.
Press the + button to add a new element.
Write a unique "name" for the new element.
If you wish, you can write a unique "value" for the new element. Or use ↑↓ to move it to a safe spot. Value is a unique identifier of the items saved in level data, it’s better to always have a unique ID for every new obstacle added (and not reuse old) in order to not break levels.
If you have done everything correctly you have something similar to the example below. Otherwise, you need to follow instructions and resolve validation errors.
Press the Save button.
Open the prefab that you want to add and add the ****Savable Item component. Inside the Savable Item component select the appropriate enum value (the one you created in previous steps).
Now you can drag your prefab to the appropriate field inside the Items tab.
