# init(identifier:url:options:) Creates an attachment object from the specified file and options. ``` convenience init(identifier: String, url URL: URL, options: [AnyHashable : Any]? = nil) throws ``` ## Parameters `identifier` The unique identifier of the attachment. Use this string to identify the attachment later. If you specify an empty string, this method creates a unique identifier string for you. `URL` The URL of the file you want to attach to the notification. The URL must be a file URL and the file must be readable by the current process. This parameter must not be `nil`. For a list of supported file types, see [`Supported File Types`](/documentation/UserNotifications/UNNotificationAttachment#Supported-File-Types). `options` A dictionary of options related to the attached file. Use the options to specify meta information about the attachment, such as the clipping rectangle to use for the resulting thumbnail. ## Return Value An attachment object containing information about the specified file or `nil` if the attachment could not be created. ## Discussion This method verifies that the specified file is readable and that the file format is one of the supported types. When errors occur, the method provides an appropriate `error` object. When you schedule a notification request containing the attachment, the system moves the attachment’s file to a new location to facilitate access by the appropriate processes. After the move, the only way to access the file is using the methods of the [`UNUserNotificationCenter`](/documentation/UserNotifications/UNUserNotificationCenter) object. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)