You can not send attachments from Mail, but must use an app that allows you to share or send the material as an email.
Some apps allow you to "share" content by opening Mail and adding the material as an email message. Some apps will allow you to copy material to temporary memory, then open Mail, place block the material you want to add, and then paste the content to your email message.
I just found an application that is perfect for sending attachments to a single person or a group. It is called Group Email with Attachments. It allows you to create email messages and attach multiple documents. The attachments are not truncated. The app costs $3.99 and is worth every penny!
I am looking for a job and this application has become a godsend!