Script won't execute on assigned 3d object but on simple cube

I am trying so interact with my 3d model that i have created and imported, but it doesn't quite work. Sorry for this noob question, but i am not knowing what i am doing wrong =/

I want to script to work on Propeller_00x but it doesn't execute, even though i have added the script component to propeller_00x. When i test the script on a simple cube created inside of Unity, the script runs like a charm. What am i doing wrong?

If you want to take a look at the testScript

 public class testScript : MonoBehaviour 
 {
     public int test = 0;
 
     void OnMouseOver()     {
         test++;
     }
 
     void OnMouseExit()     {
         test = 0;
     }
 }