How to fix this weird shading?

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#1

So I am importing 3D models from blender to ROBLOX and some model appears with barely any light shading.

Expected:

Result:

Any idea how to fix this in blender? It is not a texture issue because all other “working” texture applied on the rig also have the same issue.

#2

I have been trying to find a solution for this problem for a while, yet I still have not found one.

#3

Could it be a material-related issue?

#4

I found a fix by applying shade smooth and auto smooth in blender. It is a shader issue.