How do I import "generated" mapped textures into Unity?

In Blender, I have made a model that includes different textures that are mapped using the generated mapping. All the textures use the same source image and are only tiled and offset differently to match my needs. However, after importing, the textures are not carried over into Unity. What causes this problem? Is it that I can't use the same source image? Or does generated mapping just not work in Unity?

Here are some images:

This is the source image.

What it looks like in Blender.

(Ran out of space)

In Unity, the whole thing is simply untextured.

Thanks for your help!