One of the options when creating a new campaign is to add leads to it by uploading a csv.
Depending on where you get your file from, it may contain multiple data points, but for the purposes of uploading leads to a campaign, all you need in the file is Linkedin profile urls.
Upon uploading the file, Alfred will gather all the Linkedin profiles url and begin a verification process in order to retrieve up to date personal information from their profile such as name, company, location, etc.
Uploading a file with other data is not going to be used for personalisation purposes. For example, if you upload a file with name and Linkedin profiles, Alfred WILL NOT use the name on the file to personalise the message. It will use the Linkedin profile name details.