https://www.techradar.com/news/microsoft-pauses-windows-10-october-2018-update-over-file-deletions

Microsoft has hit the pause button in its rollout of the Windows 10 October 2018 update while it investigates reports of users having their files deleted: while many users have installed the upgrade with no problems, some early adopters have found files going missing from their Documents and Pictures folders.

"We have paused the rollout of the Windows 10 October 2018 Update (version 1809) for all users as we investigate isolated reports of users missing some files after updating," says Microsoft on the updated support page for the new software upgrade.