Umbraco 9+ rename media item to filename

MediaUploadHandler.cs

using System.Text.Json;
using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Notifications;

namespace MySite;

public class FilenameHandler : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.AddNotificationAsyncHandler<MediaSavingNotification, NormalizeFilename>();
    }
}

public class NormalizeFilename : INotificationAsyncHandler<MediaSavingNotification>
{
    public Task HandleAsync(MediaSavingNotification notification, CancellationToken cancellationToken)
    {
        foreach (var media in notification.SavedEntities)
        {
            var json = media.GetValue<string>("umbracoFile");
            if(json == null) continue;
            
            var file = JsonSerializer.Deserialize<UmbracoFile>(json);
            
            if(file == null || string.IsNullOrWhiteSpace(file.src)) continue;
            
            var filename = file.src;
            
            filename = filename.Substring(filename.LastIndexOf('/') + 1);
            media.Name = filename;
        }
        return Task.CompletedTask;
    }
}

public class UmbracoFile
{
    public string src { get; set; }
}