Can you union geospatial data files? I know you can with xls and csv but having trouble getting these files to show the Union behavior when dragging one to another.
Even if you are able to Union the geo data (before tableau or within it), I suspect your Tableau map may mis-behave on the modified data.
If you need to stick to your viz requirements, then you will have to re-shape your data before it hits tableau.
Please share your sample data & expected result.
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