How to see email attachments when replying to an email
Here's what I do:
While editing the new email, click the "pop-out" button to open the new message in a separate window.
Now the original email is available for you to view attachments.
There is a pic of the pop out button on this page : http://www.howtogeek.com/172625/how-to-enable-and-disable-the-separate-message-editing-window-for-replies-in-outlook-2013/