a)    Save and close the file you want to attach

b)    Start – Mail and create a new email

c)    Tap ‘Insert’ and ‘Attach’

d)    Navigate to the folder that contains the file you want to attach

e)    Pressing and holding ‘ctrl’ on the keyboard allows you to tap and select multiple files

f)    Tap 'open' to attach to email

Enter the recipients email address and a subject and send as normal