//отправка
 private async Task SendFileSomewhere(Stream stream)
    {
        using var request = new HttpRequestMessage()
        {
            Method = HttpMethod.Post,
            RequestUri = new Uri("https://localhost:44301/FuckingFileSend"),
            Content = new StreamContent(stream),
        };
        using var response = await http.SendAsync(request);
        // TODO check response status etc.
    }

//принятие

 private const long MaxFileSize = 10L * 1024L * 1024L * 1024L; // 10GB, adjust to your need

        [RequestSizeLimit(MaxFileSize)]
        [RequestFormLimits(MultipartBodyLengthLimit = MaxFileSize)]
        [Route("/FuckingFileSend")]
        public async Task ReceiveFile()
        {
            var boundary = HttpContext.Request.GetMultipartBoundary();
            // var boundary = MultipartRequestHelper.GetBoundary(MediaTypeHeaderValue.Parse(Request.ContentType));
            var reader = new MultipartReader(boundary, Request.Body);

            // note: this is for a single file, you could also process multiple files
            MultipartSection section = null;
            try
            {
                section = await reader.ReadNextSectionAsync();
            }
            catch(Exception e)
            {
        //вот тут ловлю исключение Multipart body length limit 16384 exceeded"
            }

            var fileName = contentDisposition.FileNameStar.ToString();
            if (string.IsNullOrEmpty(fileName))
            {
                fileName = contentDisposition.FileName.ToString();
            }
            using var fileStream = section.Body;
            //    await SendFileSomewhere(fileStream);

            string path = Path.Combine(environment.ContentRootPath, "upload", fileName);
            using var Stream = new FileStream(path, FileMode.Create);
            fileStream.CopyTo(CurrentStreams.First().Value);
        }