Question FBX Will Move But Not Jump

So I have script that allow the player to move around and jump. When I use a 3D object from Unity itself, there is no issue. The player moves and jumps as it should. Whenever I import an FBX file from Blender however the model will be affected by gravity, I will be able to move around, but it won't jump when I press the jump button. Has anyone encountered this problem before or at least knows how to fix the problem?