We've comprehensively documented when to use each type of upsell and how to make the most of them on Easy Upsell University here:
Upsells: When to Use Each Type & How to Make the Most of Them.
We've comprehensively documented when to use each type of upsell and how to make the most of them on Easy Upsell University here:
Upsells: When to Use Each Type & How to Make the Most of Them.