My steps are:

Map > New UV Map
Texture Name: Texture
a tick on Initial Value
Map Type: Atlas
Subpatch Interpolation: Linear
no ticks on move control points (old), Segment by Surface, and Segment by Part
Relative Gap Size: 50%

After that, I export the UV out as .ESP, and edited it in Photoshop, saved it as .TGA 24bits

Then in Surface Editor:

Layer Type: Image Map
Blending Mode: Normal
Layer Opacity: 100%
no tick on Invert Layer
Projection: UV
UVMap: Texture
Image: tt_inf.tga (that's my filename)
Tile: Repeat
tick on Pixel Blending
Mipmap Quality: High
Mipmap Strength: 1

Thanks for wanting to help, Machinery_Frank.