Importing source files
To import a model, use File > Import Model, press Ctrl + J, or click the import model button in the toolbar.
Make the required transform adjustments. The asset will appear in the target engine as it appears in the preview.
Material Settings
Use the Materials area on the right to review the material slots from the imported model and assign graphs to them. Use the tabs at the top to view or add material graphs..
Each imported material slot can use a material graph assignment. Use the drop-down menu to select a graph for the slot. Use Unset to remove the current assignment.
Material0 is the default material graph for the main mesh. You must always have at least one material graph, so you cannot close Material0. Use the Name field to rename the material. Add or connect nodes in the graph to change the material. Material0 contains a Texture Sample node by default.
Use the Settings panel on the left to change the material name, sidedness, and VAT processing. You can also enable grid snapping and set the grid snap size in this panel.
Here I set this materials base color to a fixed color using a vector3 constant. I did this for my other needed materials for my tree. Then I set the slots to each graph using the side bar.
To play an animation, select it from the Animation menu, and then select Play.