IFormFileCollection File Upload AWS

iformfilecollection.cs

//https://docs.microsoft.com/en-us/aspnet/core/mvc/models/file-uploads
[HttpPost]
public void Post(int ItemId)
{
    var files = Request.Form.Files;

    if (files.Count > 0)
    {
        using (var client = new AmazonS3Client(_aws.AccessKey, _aws.SecretKey, Amazon.RegionEndpoint.EUWest2))
        {
            foreach (var file in files)
            {
                using (var stream = new MemoryStream())
                {
                    file.CopyTo(stream);

                    var req = new PutObjectRequest()
                    {
                        BucketName = $@"{bucket}/test",
                        Key = file.FileName,
                        InputStream = stream
                    };

                    var response = client.PutObjectAsync(req).Result;
                }
            }
        }
    }
}