How to use Mail Drop on your iPhone

To use Mail Drop, all you have to do is try to send an email that's too big through the default Mail app.

A window will pop up that reads: "These attachments may be too large to send in email. Do you want to use Mail Drop to deliver these attachments using iCloud? They will be available for the next 30 days."

Tap "Use Mail Drop," and off the message goes to its intended recipient(s) thanks to the wonders of the cloud.

Once you hit the file size limit, you'll be encouraged to use Mail Drop.

The message will arrive like normal, massive size notwithstanding.

The recipient will just have to click the Mail Drop link in the email they've received, and they'll have to be checking their email on "a Mac using OS X Yosemite or later, an iPhone, iPad, or iPod touch with iOS 9.2 [or later], [or] a Mac or PC with an updated browser," which are the supported systems for Mail Drop, according to Apple.

https://www.businessinsider.com/what-is-mail-drop-on-iphone