# HKAttachmentStore The access point for attachments associated with samples in the HealthKit store. ``` class HKAttachmentStore ``` ## Overview Use an [`HKAttachmentStore`](/documentation/HealthKit/HKAttachmentStore) object to manage attachments for samples that your app has saved to the HealthKit store. ## Topics ### Creating an attachment store [`init(healthStore: HKHealthStore)`](/documentation/HealthKit/HKAttachmentStore/init(healthStore:)) Creates an attachment store for the provided HealthKit store. ### Adding attachments [`func addAttachment(to: HKObject, name: String, contentType: UTType, url: URL, metadata: [String : Any]) async throws -> HKAttachment`](/documentation/HealthKit/HKAttachmentStore/addAttachment(to:name:contentType:url:metadata:)) Asynchronously adds an attachment to the specified object. [`func addAttachment(to: HKObject, name: String, contentType: UTType, url: URL, metadata: [String : Any], completion: (HKAttachment?, (any Error)?) -> Void)`](/documentation/HealthKit/HKAttachmentStore/addAttachment(to:name:contentType:url:metadata:completion:)) Adds an attachment to the specified object. [`- (void) addAttachmentToObject:(HKObject *) object name:(NSString *) name contentType:(UTType *) contentType URL:(NSURL *) URL metadata:(NSDictionary *) metadata completion:(void (^)(HKAttachment *attachment, NSError *error)) completion;`](/documentation/HealthKit/HKAttachmentStore/addAttachmentToObject:name:contentType:URL:metadata:completion:) Adds an attachment to the specified object. ### Accessing attachments [`func getAttachments(for: HKObject, completion: ([HKAttachment]?, (any Error)?) -> Void)`](/documentation/HealthKit/HKAttachmentStore/getAttachments(for:completion:)) Returns all the attachments for the specified object. [`func dataReader(for: HKAttachment) -> HKAttachmentDataReader`](/documentation/HealthKit/HKAttachmentStore/dataReader(for:)) Returns a data reader for the attachment. [`func getData(for: HKAttachment, completion: (Data?, (any Error)?) -> Void) -> Progress`](/documentation/HealthKit/HKAttachmentStore/getData(for:completion:)) Returns an attachment’s data. [`func streamData(for: HKAttachment, dataHandler: (Data?, (any Error)?, Bool) -> Void) -> Progress`](/documentation/HealthKit/HKAttachmentStore/streamData(for:dataHandler:)) Asynchronously returns the attachment’s data. ### Removing attachments [`func removeAttachment(HKAttachment, from: HKObject, completion: (Bool, (any Error)?) -> Void)`](/documentation/HealthKit/HKAttachmentStore/removeAttachment(_:from:completion:)) Removes the specified attachment. ## Relationships ### Inherits From [`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class) ### Conforms To [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`Hashable`](/documentation/Swift/Hashable) [`CVarArg`](/documentation/Swift/CVarArg) [`Equatable`](/documentation/Swift/Equatable) --- 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)