When you send an email with a normal attachment (files from your PC), the selected file is copied and then attached to your email. This copy is saved on both the mail server of the sender and of the recipient, quickly using up storage space and requiring you to periodically delete old emails from your mailbox.
Attachments from myCloud look similar to normal attachments, except that no copies of the data are sent back and forth. Instead, a link to the data stored online in myCloud is sent instead. As a result, delivery of emails is faster and you do not use up email storage. This method also lets you send unlimited volumes of data.
Figure: file sharing on myCloud.ch
If you also allow your recipients to add files to your shares, these files will also be stored securely in your myCloud account. This way, you can exchange photos, videos or files quickly and easily.