Using the Item Documents option found under Items in the menu, you have the ability to upload documents such as Catalog Books, Price Lists, and more.

You may begin by clicking the New Document button.

Here, you'll choose the File Name, the Document Type, and you can add a Description if you'd like. 

When uploading a document, in addition to actually uploading your desired document (using the Select Document option), you can also choose a thumbnail to see when looking at your documents in Grid View (using the Thumbnail Image option).

While in Grid View, you can save the document to your computer by clicking the Download  (1) icon when hovering over the document.

To copy a link to share with someone, click the Share (2) icon when hovering over the document.

Similar to the Items screens, you can switch to a List View to see a bit more information, and manage any documents you've uploaded: