Upon reflection, there’s perhaps a better way for you to create a PDF, using new capabilities of iPadOS, for any document...
Simply tap the Share icon; at the very top of the Share option sheet, you’ll see a summary description of the page/document with an “Options” link. Tap this link, select PDF from the list, then select “Back” to return to the Share option sheet. Finally select Save to Files and choose the path/location for the PDF.
This may both sound and initially feel cumbersome, but actually provides significant flexibility in creating and storing output.
I hope this fully resolves your need. Please let us know how you get on.