Cinema 4D "simple" import/export issue (UVW mapping in world space)

Hi there!

One of my current teammates can't export properly from C4D to Unity, in a way that the model keeps its UVW coords.

Basically, we get the model to look properly in C4D but - it's probably something VERY noobish - we lose the world space UVW mapping when exporting.
Even by using straight the C4D file instead of the FBX export.

We're working in remote, and he's not a senior with mapping. So, we ended up creating a world-space gizmo of 1mx1mx1m to map, for instance, a room. And it looks good as long as it stays in C4D.

When exporting, we still get a room mapped 1:1 per face.

Is there anyone used with C4D and Unity to give us a few hints in the right direction?

I believe we're missing something very obvious, but I can't figure out what.

My final goal was to actually have him bake a smoothed triplanar mapping from C4D to be used on the model he exports, I found some tutorials around, but they're a bit too hard to follow for him (he's a friend trying to help the project, he works as a 2D artist/cartoonist, C4D is not his primary skill)

Any help is welcome, thanks