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A little paperclip icon lets you know that an e-mail has a file attached. You can open several types of files you receive in e-mail, including pictures, audio, videos, and documents. But—and this is an important caveat—you can send only two types of attachments from your phone: pictures and Microsoft Office documents. A file needs to be stored on your phone before you can attach it. So if you see a Facebook photo in the Pictures hub that you want to send to somebody, you need to save it to your phone first.
Fill in the sender and subject information, and then write your message.