You can save your email attachments to iCloud, Dropbox, Google Drive, OneDrive, and more!
You receive an email with a file attached to it, maybe a spreadsheet or presentation, a PDF or plain text. You don't just want to open it in an app, though. You want to save it somewhere you can remember and get to whenever you need to, and from any of your devices. That's where attachment saving comes in. With it, you can save any attachment you receive to any online storage service you use, including iCloud, Dropbox, Google Drive, or OneDrive. Then, you can access whenever you want, from wherever you want.
How to save email attachments to iCloud on iPhone and iPad
Saving email attachments to iCloud Drive is easy because iCloud built right into iOS.
Launch Mail from your Home screen.
Open the email that contains the attachment.
Long press on the attachment to bring up the Share sheet.
Tap on Save Attachment.
Note: In iOS 10, tap on Add to iCloud Drive.
Tap on the folder you want to save the file into.
Tap on Move to this location at the bottom to save the file.
Yeah, the language is precise given the mechanics of what it's doing, but it's not intuitive. Just know that, once you're done, the file will be saved in that location and accessible from all your iCloud devices.
How to save email attachments to Dropbox, Google Drive, OneDrive or enterprise storage on iPhone or iPad