https://thenextweb.com/microsoft/2018/10/08/file-deleting-windows-10-update/

Microsoft announced an update to Windows 10, along with a bunch of Surface-branded devices at its October 2 event. Just a few days later, plenty of users started reporting that some of their desktop files were automatically deleted after they installed the update. That included files stored in the default folders for documents and pictures, among others.

— Rafael Rivera (@WithinRafael) October 6, 2018