A refresh does a check on your items to determine if you have the latest file versions open in your CAD program. If you do not have the most recent file versions open in your CAD program the cBOM view highlights the item grey with a warning symbol. Place your cursor over the warning symbol to see what the latest file version is.
During the refresh, you also receive a validation window that outlines which files are not the latest version and what the latest version is.
Click Yes to have Upchain retrieve the latest file versions for you, or click Cancel to continue using the older file versions. You do not have to update the file versions but it does mean that you are potentially working with outdated information.