As others have pointed out, the documentation for Spreadsheet::XLSX clearly states that it's for reading only. I believe that you'll need to use Spreadsheet::XLSX to read in the spreadsheet and then use Excel::Writer::XLSX to write back to a file.

Also, the "WRITING_EXCEL_FILES" section of Excel::Writer::XLSX's documentation lists some other alternatives "methods of getting data into Excel".

In reply to Re: How Do I Write an Excel Spreadsheet using Spreadsheet::XLSX by dasgar
in thread How Do I Write an Excel Spreadsheet using Spreadsheet::XLSX by trickyq

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