title: Unable to attach file in WithAttachment in Xam.Plugins.Messaging
body: <p>please review my code as I am not able to attach any file in EmailMessageBuilder.
  Also I need to understand about the ContentType, what should I pass in ContentType?</p>
  
  <pre><code>FileData filedata = await CrossFilePicker.Current.PickFile();
  String Path = CrossGetLocalFilePath.Current.GetLocalPath(filedata.FileName);
  var emailMessenger = CrossMessaging.Current.EmailMessenger;
  if (emailMessenger.CanSendEmail)
  {
  var email = new EmailMessageBuilder()
  .To("to.plugins@xamarin.com")
  .Subject("Xamarin Messaging Plugin")
  .Body("Well hello there from Xam.Messaging.Plugin")
  .WithAttachment(Path, "image/jpeg")
  .Build();
  emailMessenger.SendEmail(email);
  }
  </code></pre>
  
  <p>I am using above code in Xamarin.forms (Portable), my attachment could be an image, video or any file.</p>
  
  <p>Getting error: </p>
  
  <blockquote>
    <p>Failed to attach file due to IO error.</p>
  </blockquote>