try
                {
                    // Map a drive
                    System.Diagnostics.Process.Start(@"C:\WINDOWS\system32\net.exe",
                    $"use J: {_fileUploadConst.UploadPath} {_fileUploadConst.Password} /user:{_fileUploadConst.UserName}");

                    // Delay to allow the changs to take effect
                    Thread.Sleep(2000);
　　　　　　　　　　　　

　　　　　　　　　　　　// or use File.Save() etc.
                    using var stream = new FileStream(fullFilePath, FileMode.CreateNew);
                    await fileInput.CopyToAsync(stream);
                    stream.Flush();

                }
                catch (Exception ex2)
                {
                    throw new Exception(ex2.Message);
                }
                finally
                {
                    // Delete the mapped drive
                    System.Diagnostics.Process.Start(@"C:\WINDOWS\system32\net.exe",
                    "use J: /delete");
                }

對映驅動即可。