A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate
in the Unity community.
I personally think that 4k textures are much too big :)
It just looks like UV mapping was not exported from blender with your model.
I think, question is:
Why standard keyframe animation from blender isn't imported to Unity...
Go to edit mode (tab), select all faces (ctrl+a), and then (ctrl+n) recalculate normals outside.
I know :) I'm a CAD modeler too.. but for use in Unity, Blender would be faster IMHO :)
Oh, I see.. :)
I know it was just for testing, but in this particular model it would be of course easier to just model this in blender :)
Maybe Decimate modifier can help a little :)
You should go to User preferences (Ctrl + Alt + U), and then just click "Install Add-on" button and browse for edge_fillet.py (for example)....
We have just released our first game for android, made on Unity :)
So we are very proud even if it's quite simple and small :)...