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.