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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post in the right category
INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
Downloaded the file just as the instructions said to do so, but as I drag and drop or try to upload a file an error message keeps popping up "The matching field you chose (Meeting ID) is not mapped and is required for an Update and Insert operation."
You're not supposed to choose Meeting ID. You must have messed something up in Step 12, I think. Cancel out and start over at Step 7 and be sure you get the instructions exactly right, especially Step 12, ok?