how to add a personalization to an item (like a jersey) in the cart with a drop down or box and have it change the image
At it’s most basic through theme customizations for textual information or file uploads
To start having image editing, or overlays on product images, that’s advanced personalization either through advanced customizations, or apps.
If you need a personalization customization to get text,etc from a customer per product then contact me by mail for services.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.
Contact info in signature.