When Trying to Create PDF Rendering Templates, the Only Document Type I Am Allowed to Select is “All” and the Other Options Are Greyed Out. What Is Happening?

When creating/modifying a PDF Rendering Template, only the Document Types that are not already associated with a PDF Rendering Template are available for selection.

In this situation, this would mean that all the Document Types in the system have been attributed a PDF Rendering Template (therefore, every one of them has been disabled, preventing them from being selected for this new PDF Rendering Template).

It is important to note that the "All" option does not imply all Document Types in the system; it is simply a quick way to select all the currently available Document Types (the ones that are not already associated with a PDF Rendering Template).