General Informations

-IN THE PACKED MAP REMEMBER TO DISABLE "sRGB"-

The diference betwing packed and unpacked materials is the texture maps, on unpacked materials you can set individualy every texture maps, on packed you set a Ambient Occlusion, Roughness and Metallic using only one map.

the only exception to this is Opaque/Masked (Unpacked - Packed) material because the mask is defined by the alpha channel of Base Color Map.