Slingshot Webmail: Attaching a file
If you'd like to attach a file to an email, first of all you'll need to create a new email.
Click on the Compose button in the top menu.
This will bring up the Compose window:
To add a file attachment, you can click on the button Attach a file or you can drag-and-drop the file from your Desktop (or any other folder on your computer).
Please be aware that file attachments can be no larger than 25MB in total.