The KMZ we create is a 250k face georeferenced 3D model. KMLs are usually just lines and shapes with some other info sometimes.
We are not sure about how things work on a Chromebook. Our KMZs do work with normal computers and on some of mobile Google Earth versions.
There have been a few other topics about getting them to load and adjusting the altitude. Please search for "kmz" up in the search area for more topics.