I installed FPD on a WordPress/WooCommerce theme called Porto.
The issue is that after designing the product, the custom image is not getting updated as the product featured image.
I changed the theme to TwentyNineteen and it worked without any issue. It looks like something in Porto Theme is not letting FPD update the featured image.
How can I check and debug this conflict?
Please open a support ticket on our website https://support.fancyproductdesigner.com/ so we can have a closer look at your issue.