After uploading a unique Excel spreadsheet .csv file and created Contact List A - I did the same for Contact List B, and then again for Contact List C. For every email address that was present in Contact List A, B, and C - I noticed how the Gift Card field in Contact List A was deleted. Campaign A / Contact List A - John_Doe@email.com Gift Card field = ABC-123 Campaign B / Contact List B - John_Doe@email.com Gift Card field = DEF-456 Campaign C / Contact List C - John_Doe@email.com Gift Card field = GHI-789
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