Since a notification will pop up every time a product is added from the products collection, I think that (notification/check-for-success) needs to be inside the (doseq.. form like this:

```clojure
(defn- add-to
  "Adds the given product to a content view definition"
  [products]
  (browser click ::content-tab)
  (doseq [product products]
    (sel/->browser
      (mouseUp (->  product :name product-or-repository))
      (click ::add-product-btn)
      (click ::update-content))
    (notification/check-for-success)))
```

This way it will check for success for each product that is added.