How to download Excel file to download path and open it on browser on

Question

I work on asp.net core 2.2 Web Api I face issue I can't see Downloaded file on download Path and I can't see it After download on browser

download file success on path i give it but not make download on download path and I can't see it to open it directly

my code I use it for download is :

[HttpPost, DisableRequestSizeLimit]
        public IActionResult Upload()
        {
            try
            {
                var DisplayFileName = Request.Form.Files[0];
                string fileName = DisplayFileName.FileName.Replace(".xlsx", "-") + Guid.NewGuid().ToString() + ".xlsx";
                string exportPath = myValue2 + "\\" + fileName;

                        if (exportPath != "")
                        {
                           ex.DownloadOutPut(exportPath);
                        }


                    }
                    return Ok(new { dbPath });
                }
                else
                {
                    return BadRequest();
                }
            }
            catch (Exception ex)
            {
                return StatusCode(500, $"Internal server error: {ex}");
            }
        }
function for download I use it
    public FileStreamResult DownloadOutPut(string path)
        {


                var filename = System.IO.Path.GetFileName(path);
                var mimeType = "application/octet-stream";
                var stream = System.IO.File.OpenRead(path);


            return new FileStreamResult(stream, mimeType) { FileDownloadName = filename };
        }

result I need file as on image :