I am trying to follow the multi-column layout section in the Markdown Cookbook to render a two-column pdf.
As instructed, I created the columns.tex file and saved it in my working directory. And copy the exact same code in the book (only output pdf). Then I got the error that columns.tex is not found.

File columns.tex not found in resource path
Error: pandoc document conversion failed with error 99
Execution halted

Maybe I put the file in the wrong location. I wonder how to make markdown find the file.

Many thanks