Remove duplicated product images

In rare cases it might turn out that some of your products in the source file contain duplicated attributes. One of the most common duplicates of that type are additional image links, which will be displayed more or less like so:

To fix that we need to implement a simple rule based on unique array. In order to ensure this problem won't occur on any external feeds of our choice, we recommend applying that rule directly on the Import.

IF

all elements

THEN

Take additional_image_link (the value we mapped the attribute with)

And Unique - array -> Mode: String