After discussing the information in this forum post, I have successfully displayed the 2D sheets view (left panel) in the Autodesk viewer for PDF files and other 2D files.
https://i.sstatic.net/OFATj.png
https://i.sstatic.net/WXMlT.png
However, I am facing an issue where clicking once on the links in the left panel does not render the view in the viewer. It only shows loading but does not load. Clicking on the same link twice makes it appear. Therefore, I have to click twice on the same link to display the sheet in the viewer.
This issue only happens with "PDF" files. For other 2D files like "DWG" and others, a single-click works as expected.
When I click on any sheet, it displays this error in the developer console: Uncaught TypeError: Cannot read property 'dispose' of null https://i.sstatic.net/5pXnR.png
But clicking again makes it appear correctly.
I am unsure about the actual cause of the problem.