GLTFAnimancerTest.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Siccity.GLTFUtility;
using Animancer;

public class GLTFAnimancerTest : MonoBehaviour
{
    public AnimancerComponent animancer;
    public GameObject result;
    GameObject armature;
    AnimationClip[] animClips;
    Animator animator;

    IEnumerator Start() {
        WWW wwwGLTF = new WWW("http://example.com/example.glb"); //your url here
        yield return new WaitUntil(()=> wwwGLTF.isDone);
        byte[] gltfBytes = null;
        gltfBytes = wwwGLTF.bytes;
        result = Importer.LoadFromBytes(gltfBytes, new ImportSettings(), out animClips);
        yield return new WaitUntil(()=> result != null);
        for (int i = 0; i < animClips.Length; i++) {
            Debug.Log("gots anim clips named " + animClips[i].name);
        }
        if (animClips.Length > 0) {
            armature = result.transform.Find("armature").gameObject;
            animator = armature.AddComponent<Animator>();
            animancer = armature.AddComponent<AnimancerComponent>();
            animancer.Animator = animator;
            PlayAnimation();
        }
    }

    void PlayAnimation() {
        Debug.Log("tryna play");
        
        var state = animancer.Play(animClips[0]);
        state.Time = 0;
        state.Events.OnEnd = OnAnimationEnd;
    }

    void OnAnimationEnd() {
        PlayAnimation();
        Debug.Log("animation ended");
    }
}

loads model using https://github.com/Siccity/GLTFUtility with coroutines, but uses the animation control package Animancer -https://kybernetik.com.au/animancer/ -instead of Unity's legacy internal system.