Blender-Unity, Alembic: can't see simple basic cube mesh after import.

I have an array animation in Blender, that I want to export to Unity.
I was going to try Alembic file format to do it. I found this package for importing Alembic files into Unity - https://github.com/unity3d-jp/AlembicImporter

I desided to make simple test first and to export just a cube with no animation from Blender To Unity as an Alembic file.
But after export I can’t see anything, though I see the pivot point of the cube.

Blender scene:


Export settings:


Unity scene after export (test-4-1.abc is the name of the Blender scene after export as an Alembic file):


I would really appreciate an advice!
Thank you in advance!