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I can't find this in the drop down either. I believe that I have the right add on because I see .accdb in my list. @AlexP mentioned that it was released in 18.1, but my version is 11.8.4.41598?
Edit: In case anyone else runs into this... I reached out to AlexP and she said that I needed to install 2018.1 version. Alteryx didn't let me know of the new version like it usually does, and even checking for updated through the application mentioned that I was up to date.