It would be useful to be able to enter a link to a page number in a PDF file.
I work with hundreds of PDF files where many are hundreds of pages long. Navigating to key information in the PDF files is challenging. Being able to link to specific pages would be very helpful.
This would allow setting up table of contents or hot links to important content in the description field so navigating PDF files would be more useful.
This also allow setting up markdown files with links to specific pages in a PDF, then the markdown files could be tagged. This would help in finding specific information in large libraries.