@artistvit when I import the FBX files into Unity, and configure the rig, the shoulder and hand bones get messed up. They lift up or curl and ruin the anatomy. Can you help me? I already tried disabling the "optional" shoulder bones in settings, but that did not work. 
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hii, i didnt try to import into unity personally, but it seems like an issue with bone orientation, have you tried applying some animation from mixamo for example? how does it look? you can also try to fix orientations in blender or just reexport through blender and see if it helps if you usually import blender rig