VERY THANKS Michael

I use "Weld vertices alone edges" ON, "N-gones" to OBJ not good
I use "Weld vertices alone edges" OFF, "N-gones" to OBJ not good
I use "Weld vertices alone edges" ON, "Quads& TRiangles" to OBJ good but I don't like the Triangle faces---
I use "Weld vertices alone edges" OFF, "Quads& TRiangles" to OBJ good but I don't like the Triangle faces---

USE FBX is all OK---- Thanks-- I Learned more--