Shopify coding help!

Hello,

I recently added a upsell section to my product pages. I'm having trouble with the checkout button for the different quantities.

How do I link the checkout button with the different quantities of the product?
If anyone can help, please let me know. Thanks


(if you need info on the code, let me know)

here needs to see code, frontend, backend etc

I highly doubt somebody will be able to help you in a public forum. You'd need to give someone Staff permissions for your Shopify store so they can make the changes. I would probably look to hire a freelancer on Upwork.