I moved this post into the Web Data Connector space. There is a better chance that the Tableau Community in this area can assist.
My commenting will also raise this thread back to the top of the feed. If you were able to find a solution, please share it with forums!
Special thanks for your action, I hope I can find answer soon,
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The blog post that you referenced explores using a hack to import a file using the Web Data Connector import file feature. However, that feature was deprecated in Tableau Server 10.5, and with the move to TSM the functionality to import the WDC files was removed from the product. That means that the solution outlined in that blog post won't work in Tableau Server 2018.2 or later. See the note here at the bottom of the Web Data Connectors page in the Tableau Server Admin Guide.