You can add new documents through Documents → Add New Document in the WordPress Administration Panel.
Documents contain most of the same options as standard posts. You can read about these in the Add New Post chapter. Additionally, they contain post options specific to documents.
Document Options are found below the editor on the Edit Document page. If the Document Options are not visible, make sure they are checked inside the Screen Options area at the top.
The header image is displayed behind the title at the top of the single document page in the front-end. Select a wide but short image, around 1680px x 275px. Click the + button to upload an image.
If you don’t add a header image, the default background color will be displayed.
This is where you upload the document. It must have a
Add the size of this file, in any unit, such as KB or MB, for example 1.45 MB.
Set to On to display the sharing buttons for Twitter, Facebook, Pinterest and Google+.