Adding connected records to Knack from a csv file

I need to load some extracted data into Knack and would like to use Make. I have several scenarios in place to do other things, but this one has me scratching my head. Currently I can load the extracted data from a .csv file manually by mapping the connected field to the correct column and everything works fine. However, when I do the same mapping in Make, the connected field is blank. Has anyone done something like this?

Thanks,

Scott