Now, press the button Open Inventory Capture Tool, so the mesh created is rendered in the window to take a picture of it.
Configure the resolution of the image (the default value is 1024x1024) and the name of the capture. Also, you can use the values of position and rotation to rotate the object for a better perspective and move its position to place it correctly inside the capture. Once it is configured, press the button Get Capture.
In the folder path Assets/Game Kit Controller/Prefabs/Inventory/Captures, the new icon is stored. Also, the icon is assigned in the new inventory object in the Inventory List manager.
Then, configure the values for the object if can be used, equipped and/or dropped. The option Amount Per Unit is used normally for elements like fuel, where the player has for example 10 cans and every can has 10 liters. The Infinite Amount is used to set the inventory object with infinite uses.