Question about Document Notebooks

Hello, I am wondering if anyone knows how to access document notebooks for any PDF/Video I import. Currently, I only have the option to view the document notebooks on one video that I have imported. I attached photos to describe what I mean. I would like to have a document notebook (or multiple ) for every PDF i have


I think you can choose to add a document layer, just like in the picture below. If the difference in our versions prevents you from finding this option, please let me know.TT