Official comment
We are thrilled that you are happy with the results. The KMZ file will show up. It can take up to a minute to fully load as it is pushing the limits of the KMZ 3D file type.
There is a OBJ importer for SketchUp but it is expensive:
https://extensions.sketchup.com/en/content/simlab-obj-importer-sketchup
I would recommend importing the OBJ into MeshLab and then exporting it in another compatible file type.
We attempt to keep the low-resolution preview version to less than 2 MB. The models are often up to 1 GB and can not be loaded in a standard browser. If you want people to be able to view the full resolution version for free you can share the link to the files and recommend that they view it in MeshLab (free) or you could upload it into SketchFab to give you a way to share a higher resolution version. Up to 50 MB.
I hope that helps.