Editing a phtml page - edits not showing up

Just installed the latest version on a test server and am working through the configuration and edits.

I tried following the instructions in Step 4 here to edit the product page:

https://support.weltpixel.com/hc/en-us/articles/115000705293-How-to-customize-css-xml-phtml-js-files-in-Magento-2-examples-Tutorial

I edited the addtocart_plus_minus.phtml file after making a copy of of it and putting it in the correct directory (/app/design/frontend/Pearl/weltpixel_custom/WeltPixel_ProductPage/templates/product/view/type/grouped). I ensured that the Quantity Input Type option was set to Plus Minus in the Product Page settings. After rebuilding the LESS/CSS and clearing caches, it's not displaying the changes from the modified phtml file. The Plus Minus buttons are not showing up. It seems I can make changes to the product pages via the WeltPixel settings in ACP but not the template file editing.