We’ve imported a lot of Order data from an M2 store into Shopify using a 3rd party app. What we’ve noticed is that the referenced products do not appear to reflect the number of sales in the Best Sellers lists. ie going to /collections/all?sort_by=best-selling will present a list of products in the “wrong order” as products that had more purchases are located on pages 2 or 3 instead of appearing quite high on the 1st page.
Does Shopify use the imported orders data when calculating the Best Selling products in collections?