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First off, you need to be on 2018.2 or later.
You have them in the right place, but Extensions are DASHBOARD objects, not WORKSHEET objects.
If you create a dashboard, you will see a new entry in the list of things you can drag into the canvas - Horizontal, Vertical, etc. and finally Extension.
I will have my tableau upgraded to latest version and then I will look into this. Currently I use 2018.1.
Yes thanks Nitin.
I have my tableau 2018.2 and I'm trying to build the Sankey Viz. But unfortunately this is the error I'm getting, though I have values. One question here is, if the values are < 0 i.e. negative values, will the Sankey Diagram not build? Below are the screen shots. my measure value has values < 0. When I build the same diagram by using number of records, then there was not error. Please advise.