Tableau Interview Question - How to join all the files that are present in the folder 

Tableau interview questions series where objective is that you practice the questions like it has come in interview and find out the answers. In interview they ask simple question in such a way that you start thinking about how exactly this can be done and with this series you can learn how to interpret the question by tableau functionality.
In the second question, I am asking the question that How to join all the files that are present in the folder?
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