AnyAttach is a simple but effective tweak available in the Cydia store for jailbroken iOS devices. Once installed, you can attach files from anywhere in the iOS file system to emails in the stock mail app. iOS’ file system is normally hidden, so if you’re not used to dealing with it )through apps like iFile) it might not do you any good, but if you’re already used to the access that jailbreaking gives you then it’s a nice feature to have.