Though attaching files in email is not a difficult task but sometimes, you may face trouble. When you encounter such type of problem, first thing you have to understand the type of file that is creating problem. If you are unable to send attach files like PDFs or word as the attachments in your email, then you can go for these troubleshooting steps.
Go to the email and then Copy/Paste option. Create a new email -> save it as draft -> open file you want to attach ->copy the item and return to your email draft-> paste -> and then send.
If you require attaching iWork file, you can also select the document using Gallery, then click on the first button in the toolbar and then tap on ‘send via mail’.