GitHub user dave-csc added a comment to the discussion: How to Dynamically Pass 
Input to Microsoft Excel Input Transform?

Hi @Raja10D,

you can't use Preview rows indeed because Hop GUI doesn't know the file names 
you are passing, when working in a single transform.

To get an idea of the output, you need to select the transform (click on the 
icon and not the name), and choose Preview output: this will run the pipeline 
up to the selected transform, and shows the first 1000 rows of output.

Hope this helps :)

GitHub link: 
https://github.com/apache/hop/discussions/5050#discussioncomment-12548798

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