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Uploading a static list without overwriting current contact

Question asked by 5899539f2ec410369389f2a14b49f810bc1eaf9e on Oct 2, 2017
Latest reply on Oct 6, 2017 by Grant Booth

Question is essentially stated above. I want to be able to upload a list of individuals that attended one of our events. I want to make sure though that if the person already exists in Marketo though that we are not overwriting their information. How do I upload the list without making a list of current Marketo contacts?