[Unity Editor Script] Rename Mixamo animation clips from "mixamo.com" to .fbx filename

MixamoRenamer.cs

using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEngine;

public class AnimationRenamingProcessor : AssetPostprocessor
{
    // Include any AnimationClip names here that should be automatically replaced
    private static readonly HashSet<string> NamesToReplace = new()
    {
        "mixamo.com"
    };

    private string NewName => Path.GetFileNameWithoutExtension(context.assetPath);

    private void OnPostprocessModel(GameObject gameObject)
    {
        if (assetImporter is not ModelImporter modelImporter) return;

        ModelImporterClipAnimation[] clipAnimations = modelImporter.clipAnimations;

        if (clipAnimations.Length < 1)
        {
            // Try to use the existing clipAnimations if they exist to preserve other settings (e.g. AnimationEvents),
            // but fallback to creating new clipAnimations from the defaultClipAnimations
            clipAnimations = modelImporter.defaultClipAnimations;
        }

        bool isDirty = false;

        foreach (ModelImporterClipAnimation clipAnimation in clipAnimations)
        {
            if (NamesToReplace.Contains(clipAnimation.name))
            {
                clipAnimation.name = NewName;
                isDirty = true;
            }
        }

        if (isDirty) // To prevent needlessly setting new clipAnimations in case of any side effects
        {
            modelImporter.clipAnimations = clipAnimations;
        }
    }

    private void OnPostprocessAnimation(GameObject root, AnimationClip clip)
    {
        if (NamesToReplace.Contains(clip.name))
        {
            clip.name = NewName;
        }
    }
}