IOS Local Notification Image

Hello, i am new in Xamarin, so I have one Question about Local Notification in IOS.

I must do a Image in my IOS Notification like ->(Large Icon in Android). So i using a depedency servis in Xaml and I convert image(embedded resource) to byte array. How convert my byte array to image in IOS Local Notification? . I know about attachments, but I don't have image from URL. I must convert my byte array to attachments. Please help me !!!!

I'm using a UNMutableNotificationContent.