# receivePromisedFiles(atDestination:options:operationQueue:reader:) Fulfills the promises at the specified destination. ``` func receivePromisedFiles(atDestination destinationDir: URL, options: [AnyHashable : Any] = [:], operationQueue: OperationQueue, reader: @escaping (URL, (any Error)?) -> Void) ``` ## Parameters `destinationDir` The destination location URL of the file promise. `options` An options dictionary to pass additional data. `operationQueue` The operation queue on which to call the reader block when the promised file is ready. `reader` A block to be called on the supplied operationQueue when the promised file is ready to be read. ## Discussion Call this method only when you’re accepting the file promise. All file promise receivers in a drag must specify the same destination location. The `options` dictionary is ignored for now. The `reader` block is called on the supplied `operationQueue` when the promised file is ready to be read. Avoid blocking the main thread while waiting for the file promise to be written (which can be a long process) by specifying an operation queue other than the main queue. When the source is an [`NSFilePromiseProvider`](/documentation/AppKit/NSFilePromiseProvider), the reader block call is wrapped in a file coordination read. > Note: > If writing the promised file fails, the `reader` block is still called with a non-nil `error`. There may be nothing in `fileURL`, or there may be a partial or corrupt file. --- 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)