Announcement reposted from Amazon Europe:
You can now do your initial upload for country-specific images directly in Image Manager, making it easier to manage your product images across stores.
Previously, if you wanted to have different product images available in different stores, like images with language-specific text, you had to use the Upload Images tool the first time and edit it in Image Manager. Now, you can make the initial upload of your country-specific image in Image Manager and also filter to see which images you have displayed in specific stores.
To learn how to upload country-specific images with Image Manager , go to the Manage images help page.