Microsoft Confirms Word Version 2609 Saves PDFs to a Hidden Cache Folder Instead of SharePoint

Microsoft has confirmed that Microsoft Word for Windows can save PDF files to a hidden local folder with a random file name when users try to store them in SharePoint Online. According to a Microsoft known issues support page, the problem affects Microsoft 365 for Windows version 2609, build 16.0.20430.x, and Word shows no error when it happens. Microsoft says the bug only triggers in one workflow: using Save or Save As, choosing the PDF file type, and selecting a SharePoint location.