How to Send Files via E-mail in iOS 9
So how do you attach files to your letter?
First of all create a new letter. You can do it via Create button (a square icon with a pen in the right upper corner) or via email in contact’s profile.
When you have typed in the address and the subject you should long-press on the body of the message (if you use iPhone 6s you should use 3D Touch and press harder).
By default this feature opens your iCloud drive so you can send files from there. A wise way: you don’t have to re-upload your files, they will be sent from your cloud directly. The way you select the file is absolutely the same as you do it on desktops/laptops.
If you have other cloud storage accounts activated on your device (Google Drive, Dropbox, Box, OneDrive and others) they will also appear in the list. You can manually select the drives in “Manage Locations” service.
Of course it would be more pleasing to have access to your local files as well. But that’s Apple, you know.