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

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 :