scaling of 3d tiles (created in ion from kmz with .dae models)

I have a kmz with a colada .dae tree model included which I want to convert into 3d tiles in ion. This works however the tree model is too small and I am trying to increaes its scale. Changing the scale in the kmz file only increases the size of the bounding box however the size of the object is not increasing.

How can I increase the scale, either in the kmz or when/after loading the 3d tileset into the viewer?

This is the kmz file:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="">
  <Model id="model_1">

I am using chrome, cesium 1.51 and Windows.

I think this is easiest to do with the ion location editor. If you click on the tileset in ion, and then click “Adjust tileset location” in the top right of the preview window, it should take you to a page that allows you to modify scale/rotation/location.

Let me know if that works for you!