fbx import, .fbm folder created but no textures assigned to materials

I am trying to import a fbx with many textures and materials into Unity. Dragging and dropping the file into Project panel, the .fbm folder and the materials folders are automatically created. The .fbm folder contains all the textures, but none of the materials have the corresponding texture assigned.. In the past, I have just manually dragged each texture to each material.. Is there a better way than this? -- I have tried renaming the .fbm to Textures, and then re-importing the fbx (auto-creates new .fbm folder, etc... textures still not properly assigned to each corresponding material created)