When you create LinkedIn campaigns with a CSV file as a source for your leads, please consider the following information:
Closely supports only CSV format
the file size should not exceed 2MB
each cell has to contain only one value (one email, one name, etc.)
the email column may contain empty cells
the mandatory fields for the CSV file for the LinkedIn campaign are: First Name, Last Name, and LinkedIn link. A header for each column is obligatory.
The mandatory fields for the CSV for the multichannel campaign are: Email, LinkedIn URL, First Name, and Last Name. You can use the screenshot below as a reference:
