Hi jcasqueiro,
I understand you are trying to send a large file (over 100 MB) via email from your iPhone 5s. Most email providers will have limits regarding file sizes, and video files are some of the largest. It might be easiest to Air Drop this file from your iPhone to your Mac to work with it. You can check to see if the Mail Drop feature will help you with this. Another popular option is to upload the file to sites like YouTube. Both options provide a link for the customer to access the video, versus sending through the email provider.
Share content with AirDrop from your iPhone, iPad, or iPod touch
iCloud: Add an attachment to an email
If you send an email with large attachments, it might be returned by the recipient’s email service because your email exceeds the size limit set by that email service.
If you want to attach files that are too large to send in email, you can use Mail Drop. It lets you upload attachments up to 5 GB and send a link or preview to your recipients. You can send these attachments from iCloud.com or from the Mail app on your iOS device (iOS 9.2 or later) or Mac (OS X v10.11 or later).
Recipients can download Mail Drop attachments for 30 days after they’re sent.
If you want to use Mail Drop to deliver large attachments, make sure it’s selected in iCloud Mail preferences.
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In iCloud Mail, click the Action pop-up menu in the sidebar, then choose Preferences.
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Click Composing, then select “Use Mail Drop when sending large attachments.”
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Click Done.
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While writing a new email message, click the Attach button at the top of the message window.
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Select the files you want to attach, then click the Choose button to begin uploading the files.
If your attachments are too large to send in email, iCloud Mail asks if you want to deliver the attachments using Mail Drop. If you agree, Mail Drop uploads the attachments to iCloud.
To select several adjacent files, click the first one, then Shift-click the last one. To select multiple nonadjacent files, Command-click them on a Mac or Control-click them on a Windows computer.
When the upload is complete, the attached files are listed above the message you’re writing.
To attach more files, repeat steps 1 and 2.
You can also simply drag files into your message. If you use Internet Explorer 9, drag and drop requires an add-on and Mail Drop isn’t supported. See the Apple Support article Windows browser plug-ins, extensions, and add-ons.
In the Mail Message window, click the Remove icon next to the attachment’s filename.
You can’t remove files already sent with Mail Drop. They expire after 30 days.
Last Modified: Feb 11, 2016
Mail Drop limits
Take care,