Mail Drop is an iOS 9.2 feature that eliminates the hassle of sending large files via email. It lets you upload the file to iCloud which can be later downloaded by the recipient, as opposed to sending it as an email attachment.
Using Mail Drop you can send files as large as 5GB via email, which is great since attachments usually need to remain under 20MB if you don’t want to experience any problems.
Mail Drop works for all devices running iOS 9.2 or higher – iPhone, iPad and iPod touch (and Mac too for that matter) -, but you also need iCloud set up in order to use the feature. And the recipient can download the file regardless of the platform his device is running under (Android, iOS, Windows, OS X….etc.).
How to use Mail Drop in iOS Mail app
Open the Mail app and use the ‘New message’ option to compose a new email and add the recipient and the message. You can also reply to an existing email if you want to.
Now try to attack any large file (or multiple files) that’s larger than 20MB and try to send it. If the attachment is too large, the Mail app will notify you and offer you the option to send it using Mail Drop. As a result, tap on the ‘Use Mail Drop’ option and the file(s) will be uploaded to iCloud.
Then you can send the email and it will include a link to the file which is now stored in iCloud, so the recipient can download it. As I already mentioned above, the file(s) can be downloaded from any platform and the recipient is not required to have an iCloud account either.
However, recipients that are using the Mail app on iCloud.com, iOS or OS X will be able to see previews of image attachments in the email as well as download full-resolution photos. When using different email apps or the files stored on iCloud via Mail Drop are not images, the recipients will only see the download link.
Also, you should be aware Mail Drop and iCloud have various limitations in place. For example, the files remain available for 30 days and the link might become inaccessible if it has high traffic or an extremely large number of downloads. You can read more about these limitations on Apple’s support page.