Hi Ray,
Just to clarify, is your Documents folder located in the default Windows location, or have you moved it to a custom path? That can sometimes affect how OneDrive handles syncing.
Try right clicking the OneDrive icon in the system tray. Go to Settings > Account > Choose folders. Make sure the Documents folder is selected for syncing.
And Ensure your Documents folder is located inside the OneDrive directory (C:\Users[YourName]\OneDrive\Documents). If not, you can move it or enable backup via OneDrive Settings > Backup > Manage backup.