Height Map for my own raster tiles

When I try to run the example project but just swap in my own map layer as the first layer and then set the bounding box for the area I have covered the map comes up all grey.

I have uploaded a Geotiff to the area in question. Can it render a height layer for custom raster tiles?

All code is exactly the same for the project except for the changed "private let styles =[]" and I have changed the coordinates to be for the area in question.

Start by reproducing the example project with the custom GeoTIFF raster layer, the changed styles array, and the supplied bounding-box coordinates. Compare that setup with the example's working first layer and determine whether the custom raster data can produce a height layer; done means the covered area renders instead of appearing grey.

Written by the indexing model from the issue text.