Can't figure out something that seems simple. How do I copy and paste attachments. For example, someone sends me an email with a pdf file, the only option I see in the stock email app is to preview or save the attachment. I'd like to simply be able to copy it and then, for example, paste it into another email I'm sending to someone else. The only way I see to do this is to first save the file and then attach a file. Am I just missing something?