How Merge Excel Documents works?

Hi Everyone,

As the smart service Export Data Store Entity to Excel only allows you to generate an Excel of 50 columns,
my goal is to be able to join 2 Excel into one, maintaining the columns of each one. This would be to obtain a final Excel of 100 columns.
But although the four parameters are understandable, I can't get the Excel output. Some help?

Thank you!

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