I can not import fbx

In addition to what @jenkmeister17177426 said (native 3D model import is only currently available in After Effects Beta), FBX is not currently a supported format.

Right now, After Effects Beta supports OBJ, GLTF, and GLB formats for 3D model import. We plan to add more model formats in the future. FBX is on the list.

Native 3D model support in AE is only in the Beta builds at this time. Otherwise you'll need to add an instance of Trapcode Form or Mir and then import the FBX within one of those effects.