Plays an animation on an Animator automatically

PlayAutomatically.cs

using UnityEngine;
using UnityEngine.Animations;
using UnityEngine.Playables;

public class PlayAutomatically : MonoBehaviour {

    [SerializeField]
    AnimationClip modelAnimationClip;

    PlayableGraph playableGraph;
    float playableGraphTime;

    [SerializeField]
    bool playAutomatically = true;

    private void OnEnable() {
        if (playAutomatically) {
            CreateAnimationGraph();
            playableGraph.Play();
        }
    }

    void CreateAnimationGraph() {
        playableGraph = PlayableGraph.Create();
        playableGraph.SetTimeUpdateMode(DirectorUpdateMode.GameTime);

        var playableOutput = AnimationPlayableOutput.Create(playableGraph, "Animation", GetComponent<Animator>());
        var clipPlayable = AnimationClipPlayable.Create(playableGraph, modelAnimationClip);

        playableOutput.SetSourcePlayable(clipPlayable);
    }
}