My application creates a local disk with WebDav (AOS). When I edit a document in docx format from MS Word 365, the document opens without having to provide credentials, but I cannot save the changes to it. When I edit from LibreOffice or MS Word 2007, a window appears to provide my WebDav credentials, and then the changes can be saved. Is it necessary to add an SSL certificate to edit in later versions of MS Word or is it something else?