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For devices that don’t officially offer any user-accessible, system-wide file storage, the iPad, iPhone, and iPod touch do a surprisingly good job of handling attachments to both incoming and outgoing email messages.
Usually, an incoming message that includes attachments shows a paperclip icon next to the sender’s name in the message list. Without any additional software, iOS devices can natively view (or play) a wide variety of file formats, including the following: