# CMAttachmentBearerProtocol A protocol for objects that can carry attachments. ``` protocol CMAttachmentBearerProtocol ``` ## Topics ### Processing Attachments [`var attachments: CMAttachmentBearerAttachments`](/documentation/CoreMedia/CMAttachmentBearerProtocol/attachments) All attachments for this object. [`func propagateAttachments(to: T)`](/documentation/CoreMedia/CMAttachmentBearerProtocol/propagateAttachments(to:)) Copies all propagable attachments from one attachment bearer object to another. [`struct CMAttachmentBearerAttachments`](/documentation/CoreMedia/CMAttachmentBearerAttachments) A structure that contains attachments. ## Relationships ### Conforming Types [`CMBlockBuffer`](/documentation/CoreMedia/CMBlockBuffer) [`CMSampleBuffer`](/documentation/CoreMedia/CMSampleBuffer) --- 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)