# addMultipartData(_:withName:type:filename:) Specifies a named multipart POST body for this request. ``` func addMultipartData(_ data: Data!, withName name: String!, type: String!, filename: String!) ``` ## Parameters `data` The data for the multipart POST body, such as an image or text. `name` The name of the multipart POST body. This is the name that a specific social service expects. `type` The type of the multipart POST body. This is the MIME content type of the multipart data. `filename` The filename of the attachment that you want to POST. Many social services require a filename in order to accept certain POST requests, such as uploading an image or video. If your multipart data does not require a filename, pass in `nil`. ## Discussion Possible parameter values are dependent on the target service. This information, as well as guidance on when to use a multipart POST body, is documented by the service provider. For links to documentation for the supported services, see Table 1 in [`SLRequest`](/documentation/Social/SLRequest). --- 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)