Documentation about UVs

Doing textures in Mudbox must not be like doing them in Maya at all. I found a way to export things as PSDs in the UV view, so I tried it for the hair because I thought it might be easier.

And I made something in Photoshop that I would have liked to use for the hair.

But I can't import the .tif file in. What I can do it import channel from PSD (right below export) but that gave me some weird results.