I am on Step 6, and I am able to download the Google Drive file, but it opens in Numbers in my Mac. I am not able to avoid this process, and even when I export the Numbers file to a CSV on my desktop, it still does not transfer to Salesforce properly. It says unmapped, but there is nothing I have done wrong on any previous steps in any of the previous labs.
Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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