I made a simple box in blender and imported it to unity. Now I'm facing with this weird lighting problem:
I've been messing around with normals, duplicated vertex, lots of things, even lightning properties but still I'm not getting any results at all. Why does this happen and how can I solve it?
Source blend file: https://drive.google.com/open?id=1Ze1JBRFBvhnnY-w36U2KDe7Q2zcfXsmf