the problem I use mirror overlapping to get more space in UV for my modules, and for my light map I use separate UV. my problems with the normal map when I use mirror or symmetry UV I start to see seams . you can check my files.

Ok here images show how I do :

in softimage :

export :

Unreal setting :

the problems :

the Files :

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I will REALLY happy if you see the files and knows what the problem in it. I really try a lot and I hope find the solution here.

thanks