UDIMS, I see they are supported.

So it seems that UDIMS are supported, I was able to successfully import a set of UDIMS. But now I can’t find documentation or anything on how to apply it to a material or mesh. It seems to Ignore the UV space and just defaults to 0-1.

I have the model all UVd in udim space, you can see unreal put all the UDIM textures into one texture. each one of those is about 20 individual textures.