You can offer your customers an opportunity to purchase multiple upsell products by enabling the Quantity Selector in the app dashboard. Here's how:
Go to the app dashboard and create/open an Upsell offer.
Scroll down and click Additional settings.
Under Quantity Options, put a checkmark on the Enable quantity selector on the pop-up option.
Click the Save button.
Here is a sample of how it would look on the Candy Rack pop-up:
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