I use tea and coffee child theme(ella theme).
I set up Upsell Bundled Products step by step, but it didn't work!
The price is zero and the word didn't show up and the main image didn't change after I chose the swatch.
Olivia here from the Shopify team.
Thanks for reaching out to our network with your question. I had a deeper look and I wasn't able to replicate your experience, but I can definitely guide you in the right direction for support.
Have you connected with the App Developers yet for troubleshooting? They can help you take a deeper look at the code required for set up and also double check installation steps. Follow this link to connect with the App Developers directly, but I also pulled up their contact information for you below:
I trust they can help you resolve this, but please do share the resolution with once for future viewers.