If you're using the Product Options app to include some fancy options with text fields, file uploads, conditional logic etc., it may be too much to display in the upsell offer window. If you would like the custom product options to be selected before a customer can add the product to the cart, follow these steps:
- From "Shopify Admin", select Apps.
- Select Product Upsell.
- Select Upsell Settings.
- Under "General Settings" in the "Upsell products that have custom options(Product Options)" area, enter the Button text to redirect to the product page.
- Select the Click here if you require your custom Product Options to be selected before a customer can add a product to cart checkbox (optional).
- Select Save.