To bring CAD models into Unity, it is usual to need an additional tool such as PIXYZ or CAD Exchanger.
These tools allow not only to convert the format to be compatible with Unity but also to optimize the geometry so that the performance of the application in real time is adequate.
To install PIXYZ follow the steps listed on this website: Pixyz | download PiXYZ4Unity 2022.1.0.37 (pixyz-software.com).
Specifically, these ones:
Therefore, you will have to go to the Package Manager and click on the "+" button at the top left and choose "Add package from tarball":
There you will choose each of the three .tar files inside the downloaded zip file and add them in this order:
Once done, they should show up as installed:
Now, the PIXYZ section will appear in the top bar, and it can be used as described in the rest of the video Importing 3D models from VirooAcademy.