And then upload this out.xlsx file to S3 by creating a readStream from it. Isn't there any direct method where I can create a read stream from my workbook and directly upload it to S3?

This is because converting from xlsx to vcf is a two-step process. Let us see how we can Convert Excel xlsx to vCard vcf File: Converting the xls or xlsx file to a csv file using Microsoft Excel Open ...

How to Open an XLS File in Excel. XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save ...

How to Convert All Excel Sheets to CSV With Macros. Excel's Save As command lets you save a single worksheet in the CSV (comma seperated value) format, but not an entire workbook. Saving ...