To try it out, create a CSV file with just one entry.
Import your CSV file into DT. That will create a new record. Select it.
Copy/paste it into Script Editor. Then set Script Editor’s language selector in the upper-left corner to “JavaScript”.
Click on the right pointing triangle in Script Editor to run the script.
Check if the record referenced in the CSV contains the correct metadata now.
If you get an error message, open Script Editor’s Protocol by pressing Cmd-3 or clicking on the three horizontal bars at the bottom. Post the content of the “Events” and “Answers” tabs.
If everything works fine, try it out with a larger CSV.
Read up on “Automation” in the DT handbook to learn how to install the script so that you can run it from DT’s script menu.