Upselly widget is not showing on my theme. What do I do?
It is possible that if your theme is heavily customised Upselly will not be able to automatically position itself in correct location. As a result Upselly widget might not show.
In this case you can manually specify where should Upselly widget show.
Place the following element
at the beginning or at the end, depending where you want the Upselly widget to show, of your product-template.liquid file in the sections folder or product.liquid file in the templates folder.