Normal Map on Wildcat viewer

All meshes must have the same smoothing parameters. The "Auto Smoothing" parameter is located in the Object Data Properties - Normals tab. Also, sometimes you can see the sweep seams - try to place them on the sharp edges of the model. If there are any small artifacts, I use the modifier "Weighted Normal" and use a group of vertices. I just mark problematic places in this group through vertices - and everything works.

Hey thanks for the answer. Unluckily I have already proceed with it and don't have any more upload possibility. I tried with Smoothing : Normals Only and only apply Modifiers. I figured out that they show model in lower resolution than your textures so to make your textures look better in theirs viewer you need to enlarge uv islands of that detail - just sharing the information that can be usefull for someone.
Is any one here who know the proper pipline blender - substance - wildcat ? I mean what options you need to check when exporting fbx to have properly working normal map and smoothing groups of the model ?

Hello! Try these export parameters:
Geometry:
Smoothing: Face
and check only "apply modifiers"