Worked example
For serials SN-0001, SN-0002 and SN-0003, the batch preview reports three ready rows; a malformed row appears as an error instead of entering the ZIP.
Before you print
The tool does not invent sequential numbers. Generate your unique serial list first, then paste it here or import it as CSV.
Barcode artwork is not proof of an assigned GS1 number. A free barcode image and a GS1-issued GTIN are different things.