If you have old devices that you backed up and they still may be in your cloud storage, check this out. It is also good for those of you who want to know more about managing your iCloud storage in general. It works on both iPad and iPhone.
You can now save email attachments to iCloud, Dropbox, Google Drive, OneDrive, and more! When you next get an attachment in your email on your iPad, save it to one of your cloud accounts.