I’ve solved that problem!
just use “external library” not “embedded one”!
but still have a question: is it possible to swap UVs of genesis inside Poser?
It is possible to change UV’s inside poser, but you would have to reapply the materials afterward.
I wrote a small utility shader to do this and I believe some other people have them available for download.
But is very simple to make. Just take blank genesis and select all material in Surface tab, then set UV to whatever, M4, V4, etc..
Go to content library and press + icon in lower left corner and select “material preset” from flyout and save with some descriptive name, like maybe M4_UV. Then select that preset and right click on content tab then choose “create poser companion file” and save as MC6 with library choice. This puts mc6 file in poser that change UV, you need one for each. This just has to be done once, the shaders will work in the normal manner once they are created