Maildrop

Good afternoon Nezvanova666,

Welcome to the Apple Support Communities!

I understand you would like to know how AirDrop works on your iPhone. The resources below will help you with this. I'll include information for the Mac as well in case you want to send files from your Mac to your iPhone.

How to use AirDrop on your iPhone, iPad, or iPod touch

Use AirDrop on your Mac

Have a great day!

Hi Nezvanova666,

Mail Drop is an iCloud feature that lets users send files exceeding the maximum size allowed by your email service provider.

I just received one today on my iPhone. A friend sent me a video clip that was only 2:13 minutes in length, but the file size was 257 MB!

For these files, you will see some grey text in the body of the message, for example, mine read "Available in Mail Drop until Feb 21, 2020.)

Most email service providers have a maximum of 10-20 MB for attachments, so these large files can't be sent. With Mail Drop, the file is uploaded from the sender to iCloud.com. The recipient downloads the file from iCloud.com rather than their email service provider's server.

These files are available for download only for 30 days, so be sure to save the attachment if you want to keep it.

For photos and videos, I recommend using Shared Albums in Photos, which also uses iCloud:

Use Shared Albums in Photos

Work with email attachments on iPhone - iPhone User Guide - iOS 13

Mail Drop limits

"With Mail Drop, you can send attachments up to 5 GB in size. You can send these attachments right from Mail on your Mac, the Mail app on your iPhone, iPad, or iPod touch, and from iCloud.com on your Mac or PC. All files types are supported and attachments don’t count against your iCloud storage. If a message, including its attachments, is larger than your Internet Service Provider (ISP) limit, Mail will ask you to send the attachments using Mail Drop."

Enjoy your day!