Currently, using the premier bold product options app, and just wondering how you make it so when a customer choose a swatch it changes the main product image?
Quite a few of there example website have this feature but the app does not seem to do this or I am missing something?
Thanks for the help
In order to assign variant images to the variant options created within the app, they will need to be assigned in there as well. By the way, it appears that the app being used to control your product options is actually Custom Product Options by W3, not Bold Product Options.
With that said, I've taken a screenshot below to show you how variant iamges can be assigned within the Custom Product Options app:
If you do have any further questions, I would recommend reaching out to the app developers for further instruction on how to use their app. Their support contact info can be found on their app page, here.
If there is anything else I can help you with, please let me know.