# init(exporting:as:named:sourceLocation:) Initialize an instance of this type that encloses the given transferable value. ``` init(exporting transferableValue: T, as contentType: UTType? = nil, named preferredName: String? = nil, sourceLocation: SourceLocation = #_sourceLocation) async throws where AttachableValue == _AttachableTransferableWrapper, T : Transferable ``` ## Parameters `transferableValue` The value that will be attached to the output of the test run. `contentType` The content type with which to export `transferableValue`. If this argument is `nil`, the testing library calls [`exportedContentTypes(_:)`](https://developer.apple.com/documentation/coretransferable/transferable/exportedcontenttypes(_:)) on `transferableValue` and uses the first type the function returns that conforms to [`UTType.data`](https://developer.apple.com/documentation/uniformtypeidentifiers/uttype-swift.struct/data). `preferredName` The preferred name of the attachment to use when saving it. If `nil`, the testing library attempts to generate a reasonable filename for the attached value. `sourceLocation` The source location of the call to this initializer. This value is used when recording issues associated with the attachment. ## Discussion> Throws: Any error that occurs while exporting `transferableValue`. Use this initializer to create an instance of [`Attachment`](/documentation/Testing/Attachment) from a value that conforms to the [`Transferable`](https://developer.apple.com/documentation/coretransferable/transferable) protocol. ```swift let menu = FoodTruck.menu let attachment = try await Attachment(exporting: menu, as: .pdf) Attachment.record(attachment) ``` When you call this initializer and pass it a transferable value, it calls [`exported(as:)`](https://developer.apple.com/documentation/coretransferable/transferable/exported(as:)) on that value. This operation may take some time, so this initializer suspends the calling task until it is complete. --- 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)