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Using cobby from a saved workbook is not supported.
When you load products in a locally saved copy of your product data, changes to the preset will never get updated, including new attributes. Always start cobby from a new blank workbook instead.
To use cobby with your local data, you can either:
copy the sheets with your local data and paste them in the workbook cobby is used in. If your local data needs saving afterwards you can copy the sheets back to the workbook they originated from.
open your local data and then load products in cobby. When your work with cobby is done, don't save the file.