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The first questions that come to mind here are: what is an NSExtensionItem and what are NSItemProviders? Extension items are the input the extension gets from the host app. An extension item has attachments, which are a list of NSItemProvider. Attachments can be seen as the user’s intent. So if the user wants to share five images, you will get five item provider. Each of these item provider can then be represented in different ways. So for example an image could be represented either by a file URL pointing to the image, by the image data itself, or maybe even textually. Therefore each item provider can have one or more items. Ideally, what you usually want to do is iterate over the item provider and pick one representation per provider to process. While the Photos app hands over multiple attachments in one item provider, Safari may hand you over multiple extension items, each of which effectively describing the same resource but in different forms. So the best approach here is to pick one extension item and process all of its item providers.