Blender Import not visible (normals are good)

Hey,
I tried to export my blender Object that is wrapped by an Armature an has animations but as soon as I pull the Object in Unity in my Scene it is not visible. I tried to export only the Mesh without Armature and it worked fine.
Iam new to Unity and blender and it would be a great help if one of you knows a solution if you need some more information about anything I will provide it.