Ever since Apple introduced app sharing extensions in iOS 8, budding iPhone photographers have been wondering where Instagram's extension was. Wouldn't it be nice if you could share a photo from any app, rather than diving into Instagram and choosing from your camera roll? You're getting that chance today: Instagram has quietly introduced a sharing extension to the latest version of its iOS app. So long as you turn on the extension, any app that supports iOS' official sharing method can send a photo Instagram's way. That's a particularly big deal if you're fond of third-party imaging apps, which don't always automatically save pictures to your photo library.