Loesch wrote:I thought of that and moved both of the two sliders (shape height and base height) up and down, but it didn't reveal any additional detail in the model.
Pay attention to Adrian, he said "zero plane position" not "shape height and base height". He was referring to THIS slider when you import the model:
If you do not set that slider correctly when IMPORTING there is nothing you can do to fix it later on.
Here is your model when the slider is set correctly when IMPORTING: