Adding .pdf image to a post

I am trying to add something from a .pdf file into a post. I only get the title of the image.

I did find very clear instructions from an earlier forum entry:
1. Add new post.
2. Click “Add Media” button.
3. Using the file selection thing, select your PDF and click the upload button.
4. After it uploads, you’ll have this new section that shows a Title, Caption, Description, and Link URL. Fill in any of the fields the way you want.
5. Click “File URL”.
6. Click “Insert into Post”.

The problem arises from point 5. At this point you can click on “File URL” but nothing happens whatsoever. There is no option entitled “Insert into Post”. So the instructions are not working.