Your software
My Mautic version is: 2.15.3
My PHP version is: 7.1.33
Your problem
My problem is:
I have a list of profiles I want to use in order to “update” certain information for these contacts, however my file also contains users that are not already in mautic, and I don’t want them to be imported at all. I want mautic to only look at these existing contacts and update them