If your Product Upsell offer has disappeared, it may be because a start and end date were put on the sale and it has ended. To reactive it, follow these steps:
- From "Shopify Admin", select Apps.
- Select Product Upsell.
- Select Current Offers.
- Select Edit next to the offer you would like to reactivate.
- Scroll down to "and these conditions are met...", select edit next to the date condition.
- Adjust the Ends date or select Delete Condition.
- Select Save Upsell Offer.