CSV to XLSX Converter

Debug Version - Let's see what's happening!

Debug Information:

POST Request: NO
File Uploaded: NO
Upload Error:
PHPSpreadsheet Available: NO

Setup Required: PHPSpreadsheet is not available.
Run: composer require phpoffice/phpspreadsheet

How to use:
1. First click "Debug Mode" to see if everything works
2. If debug shows success, try "Convert and Download XLSX"
3. Check the debug info above for any issues