The %cg and %co Naming option in the file name will only be displayed if the Gain/offset are added in the Event Settings.
If this information is not added here then only “NA” is displayed.
Is it possible,
If Event Setting per event is set to “Not Set” then the Gain/Offset under the Spanner “ZWO Setting” is taken into consideration and displays that information Gain/Offset in the file name.
I think this would work better in the long run.