Cloud attachments are attached files uploaded to a cloud storage service, so instead of sending the file directly, you are only sending a link to the given file to the recipient, which he can then use to download the file from the Cloud server. This way the message you are sending is much smaller in size and this can be especially useful when sending a large files or a big amount of files.
Linked attachments have also a number of other perks - since you have instant access to your cloud storage you can update or remove the file at any time. You can also protect your file with a password or set an expiration date. This gives you better control over your data and makes sending files safer overall.
eM Client currently supports these cloud storage providers:
You can set up your preferred Cloud Providers in Attachments settings and read about using Cloud attachments in your messages.