Why isn't Unity importing my SketchUp file's material?

I created a box in SketchUp Make 2017 and applied a PNG file as a material:

112012-brassbox.png

I saved this, and then imported the SKP file to Unity 2017.3.0f3. The box imports but the material is blank.

Note that the material does appear in Unity’s preview window in the “Import New Asset” dialog.

Is this a bug? The behavior is the same if I use the Web-based, “SketchUp Free” version of SketchUp.

I just tested and it works fine for me.
Here is what i do:

1- Save .skp file as 2015 version

2- Import .skp file to Unity (Make sure ‘Import Materials’ is ticked at Materials section under Inspector tab)

3- ‘Materials’ and ‘Textures’ folders in the Assets folder should appear automatically.

112039-materials.jpg

yup i just checked and it works fine for me too!

oh yeah, by saving the sketchup version to 15