Error Uploading KML File Converted from Plant3D DWG to Cesium Ion – How to Upload as 3D Tiles?

Hello,

I created a DWG file using Plant3D and converted it to a KML file through Navisworks.
After uploading the converted KML file to Cesium ion, I encountered an error message, as shown in the attached image.

Is there a way to upload this KML file by converting or applying it as 3D Tiles?

Thank you in advance for your help.

’ We were unable to process your data due to the following issue:

Error: Input does not contain any eligible features for tiling.

Read about what data formats are supported on Cesium ion.’

This seems to be the same as Error Uploading KML File Converted from Plant3D DWG to Cesium Ion – How to Upload as 3D Tiles? , but with slightly different details. Not sure which one to delete.