Magento2 PWA Upsell Products Add-on
For Magento 2 PWA Studio, on the product detail page, there is no upsell product feature available for now. The Upsell Products Add-on is used to show products that may be of interest to customers who have considered a product. The items shown as upsell products might be the most popular, higher quality, or have good profit options. This add-on is fully responsive, which ultimately makes it compatible with most mobile devices.