The Product Addon Ultimate and WooCommerce PDF Invoice/Packing Slip plugin are compatible with each other.
Go to Appearance > Editor > Theme Functions (functions.php) and insert the following code snippet to have compatibility with the plugin.
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July 27, 2021
Hello, I added this code to my Theme Functions but did not see any changes. Is there any additional settings I am missing?
July 28, 2021
Kindly share the active theme’s functions.php file via this link here.