Posting a sample of text or graphics.

Hello,
I would like to know how one can post a sample of text for font identification, or of graphics for criticism, here on the site. If one has a sample in mind which he wants to appear in his posting, and which is in the form of a .pdf file, for example, can he simply use the "attach files" button below to attach it to his posting, and thus have it appear?
Thanks much,
Hal