For convenient of renaming animation clips from fbx files

MixamoTools

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

public class MixamoTools : EditorWindow
{
    private static MixamoTools _window;
    
    private Object[] _selectedAssets;

    Vector2 scrollPos;

    private void OnGUI() {
        _selectedAssets = Selection.objects;

        EditorGUILayout.BeginVertical();
        GUILayout.Label("Selected Models");
        if(_selectedAssets != null && _selectedAssets.Length > 0)
        {
            scrollPos = EditorGUILayout.BeginScrollView(scrollPos, false, false, GUILayout.Height(150));
            foreach(Object o in _selectedAssets)
            {
                EditorGUILayout.ObjectField(o, typeof(Object));
            }
            EditorGUILayout.EndScrollView();
        }
        EditorGUILayout.Separator();
        if(GUILayout.Button("Change AnimationClip name to filename"))
        {
            ModelImporter mi = null;
            // AnimationUtility.GetAnimationClips()
            foreach(Object o in _selectedAssets)
            {
                string path = AssetDatabase.GetAssetPath(o);
                int last_slash = path.LastIndexOf('/');
                int last_dot = path.LastIndexOf('.');
                string filename = path.Substring(last_slash + 1, last_dot - last_slash - 1);
                filename = filename.Replace(' ', '_');
                mi = ModelImporter.GetAtPath(path) as ModelImporter;
                ModelImporterClipAnimation[] clips = new ModelImporterClipAnimation[mi.defaultClipAnimations.Length];
                clips[0] = mi.defaultClipAnimations[0];
                clips[0].name = filename;
                mi.clipAnimations = clips;
                mi.SaveAndReimport();
            }
        }
        EditorGUILayout.EndVertical();
        // _window = 
    }

    [MenuItem("Tools/MixamoTools")]
    static void OpenWindow()
    {
        if(_window == null)
        {
            _window = GetWindow<MixamoTools>();
            _window.titleContent = new GUIContent("Mixamo Tools");
        }
        _window.Show();
    }
}