Proper way to import models

Hi everyone. I tried several things and did web searches before posting this. I built a house interior in 3DSMAX, and textured it with a multisub material for the walls, and floor. I exported it as a .fbx and saved the .fbx file and the maps in the same directory in my project. When I brought my model into Unity the textures didn't show up on the model. I then tried exporting the walls and floor separately, each using its own map rather that a multisub. When I brought this model into Unity the textures still wouldn't show up. What am I doing wrong? Thanks.