Importing two glb models then render the scene

Is there are a way to import the 2 models then render them with the scene
so I have 2 ground and 2 models the scene is rendering before the models are loaded
the 2 ground are rendered in the scene the 1 model than the other one
is there are a way to make them load or render together

Sounds to me that you want to append extra assets:

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