Need help with animating HP bar

I'm trying to use a spritesheet for displaying my player's health bar. I am trying to change the animation's time when the HP variable is at a certain point so the HP sprite reflects the current HP. For some reason, the inspector is not letting me select the animation. When I go into the inspector, I can see the option to select an animation for the variable, and I can highlight it and select it, but this selection is not reflected in the editor. Yes, I have relaunched.

Script in question:

 using UnityEngine;
 using System.Collections;
 
 public class emptyHealth : MonoBehaviour {
 
     public int hP = 3;
     public Animation anim;
 
     void LOSEONE() {
         hP -= 1;
     }
 
     void Update () {
         if (hP == 3) {
             anim["health"].time = 0;
         }
         if (hP == 2) {
             anim["health"].time = 0.5f;
         }
         if (hP == 1) {
             anim["health"].time = 0.75f;
         }
         if (hP == 0 || hP <= 0) {
             anim["health"].time = 1f;
         }
     }
 }