When attaching a file to an e-mail, you may attach 1 file with a maximum size of 1 MB. If you need to send multiple files, or a file that's larger than 1 MB, embed the file within a link in the body of your e-mail instead. Upon clicking the link, the recipient will download the file embedded within.
To attach a file via link, first type the text you wish to create as a link into the body of your e-mail.
Next, highlight the text that you would like to create as a link, then click the link icon on the toolbar.