I was thinking of attaching one of my songs and as you had said to go to the full screen at the bottom that's where I was heading, but couldn't get past this darn thing.
No Audrey, if you just post a new message or click on "Reply" to someones post you don't have to do anything, the "File Manager" is always available for attaching files.
It is only if you use the "Quick Reply" box there is a button on the bottom of the box there ( not the page ) that says "Switch To Full Screen Reply" that then makes the "File Manager" available. You never need to click on those Google ads unless you want to.