You will have it to add it a post onve the Garage is in place. The 1st post in a Garage thread has some magic around it that makes it unlike a normal post. To the second post in the thread, or subsequent posts, one can add a PDF as an attachment much like you did in the thread you have going.
Click on Go Advanced as you would for a reply to a post. Scroll down, you will see the Attach Files section.
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Thanx Nathan, I was hoping to add it like a pic is added, but the 2nd post works almost as well.