Customize template

I might be missing something but the instruction to enable customizing a template,

“Want to use your own template? Copy all the files from wp-content/plugins/woocommerce-pdf-invoices-packing-slips/templates/Simple to your (child) theme in wp-content/themes/artemis-swp/woocommerce/pdf/yourtemplate to customize them”

That doesn’t seem to change anything.