Question Importing objects with shaders from blender

When I try to import fbx/obx file from Blender with materials that have default "Principled BSDF" surface, it imports normally and I can see materials when I import it in Unity, but when I try to import objects that have any other shader like "Emission" or "Diffuse BSDF" I don't see them. Is this problem in Unity or Blender and how can I fix it??