Who can do this?
Signal: Contact Tracking
Notes

If we are creating leads in your Salesforce, it’s crucial that we ensure our fields (and any custom fields we are updating) are being mapped to contacts upon conversion.

First, navigate to the object manager in Salesforce, then:

"Lead" -> "Fields and Relationships" -> "Map Lead Fields"

Once on the custom fields selector screen, be sure to map any relevant custom fields to your Account, Contact, and Opportunity objects. At a minimum, you should map all fields that will be updated by UserGems