I cannot drag the animations into inspector please help [code snippet included] [C#]

Okay, so this is what happens, whenever i drag the animation to the inspector, all what happens is nothing!, it does not go into the animation slots Here's the code snippet:-

this is done in C#

 public class anim : MonoBehaviour
 {
 
     public Animation aanimisnew;
     public Animation wwww;
 
     void Start()
     {
         wwww.Play();
     }
 
     private void FixedUpdate()
     {
         if (Input.GetKey("d"))                          
         {
             aanimisnew.Play();
         }
     }
 }