To Unsupress contacts via upload, please follow these steps:
To do so go to Contacts->Suppressions
To Unsuppress via file, click on Actions->Unsuppress via file, then choose the csv file from your local library and click “Remove from Suppression”.
*** Make sure the csv file only contains the email address of the contact you wish to unsuppress.
To learn more about different suppressions and how to manage them inside Remarkety, click here.