Hi Franz,
I got a chance to look into why your KML wasn't loading.
But I tried unzipping your KMZ into a KML and it still didn't upload. The reason is that the iNat KML uploader currently doesn't support KMLs with multiple objects. But there's a bug where it was just failing silently without alerting this fact. I made an issue here that we'll hopefully fix soon:
I'm attaching a modified version of your kml (ucb_mod.kml) where I unioned all of the separate objects into a single multigeometry. I tested it and it works if you want to try using that now to make your place.
If your interested in how I made this modified place, I here's the steps I did using a free plan on
CartoDB an awesome web GIS platform I highly recommend:
Step 1. Upload your KML: (assuming you signed up for CartoDB) Click on Datasets -> New Dataset -> drag and drop your KML -> Connect Dataset
Step 2. Union the geometries: Click 'SQL' on the side menu and enter 'SELECT ST_UNION(the_geom) FROM ucb' where ucb is the name of your dataset, then click 'Apply the Query' then 'Create Dataset From Query', you should now just see one row in this new unioned dataset as opposed to the multiple rows in the original dataset.
Step 3. Export the unioned dataset as a KML: Edit -> Export -> KML