PDF won't open from Office 365 app

[Android Central Question]

I'm not sure what happened or when because I have not tried to open a PDF for Outlook app in a while. So I have a Pixel 2, for some reason, I can not open or save PDFs from the Outlook app. No, recent updates or anything like that. Can open them from Gmail, or file but not from Outlook. I tried a restart of the phone, deleted the app and reinstalled it, still can't open or save them. I'm at a loss. Any help is greatly appreciated.