Some Objects and Nodes need to be linked to another piece of data to function, whether that be an Asset or an Object.
For example, a Sprite Object supplies the Attributes to customize how an Image is represented in a Project, but it is not the Image itself. It needs to be linked to the Image Asset, so that Incari knows what Image to apply these Attributes to.
Depending on how you create Nodes or Objects, the Asset/Object slot may already be linked to some data. If there are no assigned data, you will need to drag the element on the slot to create a link. This can also be done by selecting the Asset/Object first, then clicking the small arrow button at the side of the slot to assign it.