Importing into a select field from CSV

I’m having trouble figuring out how to import into a select field in my collection from a CSV file. Everything is setup in my file correctly, and I can map most fields, but for some reason my SELECT field is grayed out/disabled when trying to map the URL in my csv file to it.

Do I need to format my CSV file in a particular way? or is this not possible?

Thanks all :slight_smile:

Here is my public share link: LINK
(how to access public share link)