Why does my OneNote App use OneDrive instead of PDF viewer?

[AC Question]

The OneNote App on my Galaxy S6 has always opened PDF attachments embedded in OneNote using a PDF view application that I have. The last few days it defaults to opening the PDF files with OneDrive and just goes to a page with a big X on it and a code (Screen Shot attached). I know that you are supposed to be able to remove the default program in the settings. I reviewed the default settings in OneNote, PDF, and OneDrive and can't see any default connections for PDF files. I have completely uninstalled OneNote and re-installed and still have the same issue.