> ## Documentation Index > Fetch the complete documentation index at: https://docs.tightknit.ai/llms.txt > Use this file to discover all available pages before exploring further. # Retrieve a message attachment > Returns one message attachment by its id. ## OpenAPI ````yaml /openapi-v1.json get /v1/messages/{message_id}/attachments/{file_id} openapi: 3.1.0 info: title: Tightknit Admin API version: 1.0.0 description: Administrative access to a Tightknit community. servers: - url: https://api.tightknit.ai security: - Bearer: [] tags: - name: API keys description: Inspect the key a request authenticated with. - name: Awards description: Badges and certificates a community grants its members. - name: Events description: Read, create, update and delete events on the community calendar. - name: Journeys description: Read multi-step member programs and their milestones. - name: Tags description: The labels that classify events and content resources. - name: Groups description: The segments a community sorts its members into. - name: Content description: >- The collections a community files its content under, and the links and events in them. - name: Feeds description: The Slack channels and site-only spaces a community posts in. - name: Files description: Images and documents a community has uploaded. - name: Messages description: What a community has published. - name: Members description: The people in a community. - name: Slack messages description: >- Messages sent to Slack. Sending is the only operation: they cannot be read, edited or deleted here. - name: Compositions description: >- Message Blaster drafts: messages saved in Studio before, and kept after, they are sent to Slack channels and members. An API key sees only the compositions shared with every Studio user. - name: Follows description: What a member follows. - name: Polls description: The questions a community puts to its members in Slack. - name: Activity logs description: What members did in the community, and when. - name: System description: Service health. paths: /v1/messages/{message_id}/attachments/{file_id}: get: tags: - Messages summary: Retrieve a message attachment description: Returns one message attachment by its id. operationId: getMessageAttachment parameters: - schema: type: string pattern: ^msg_[a-zA-Z0-9]{12}$ description: The message's id. required: true description: The message's id. name: message_id in: path - schema: type: string pattern: ^file_[a-zA-Z0-9]{12}$ description: The id of the attached file. required: true description: The id of the attached file. name: file_id in: path - schema: anyOf: - type: string enum: - file - type: array items: type: string enum: - file maxItems: 1 description: 'Repeatable. Returns the named relation inline. One of: `file`.' required: false description: 'Repeatable. Returns the named relation inline. One of: `file`.' name: expand in: query style: form explode: true responses: '200': description: Success headers: Request-Id: description: Identifier for this request, quote it in support tickets. schema: type: string content: application/json: schema: $ref: '#/components/schemas/MessageAttachment' default: description: Error headers: Request-Id: description: Identifier for this request, quote it in support tickets. schema: type: string content: application/problem+json: schema: $ref: '#/components/schemas/Problem' security: - Bearer: [] components: schemas: MessageAttachment: type: object properties: object: type: string enum: - message_attachment description: Always `message_attachment`. id: type: string description: >- The attached file’s id, which keys the attachment within its message. example: file_2b3c4d5e6f7g message_id: type: string description: The id of the message the file is attached to. example: msg_9f2b8c1d4e5a file_id: type: string description: The id of the attached file. example: file_2b3c4d5e6f7g position: type: integer minimum: 0 description: >- Where the file sits among the message’s attachments, counting from zero. created_at: type: string format: date-time description: >- When the attachment was last written, which an edit to the message’s body or images resets. file: $ref: '#/components/schemas/File' required: - object - id - message_id - file_id - position - created_at Problem: type: object properties: type: type: string description: A URI naming the problem type. Always `about:blank`. example: about:blank title: type: string description: A short summary of the HTTP status. example: Not found status: type: integer description: The HTTP status code. example: 404 detail: type: string description: What went wrong with this request, when there is more to say. code: type: string description: >- A stable, machine-readable error code to branch on, unlike `title` and `detail`. example: not_found param: type: string description: The request field or parameter the error is about, when one is. request_id: type: string description: >- The id of the request, also sent as the `Request-Id` header. Quote it in support tickets. example: req_9f2b8c1d4e5a6b7c8d9e0f1a2b3c4d5e required: - type - title - status - code File: type: object properties: object: type: string enum: - file description: Always `file`. id: type: string description: Unique identifier for the object. example: file_2b3c4d5e6f7g name: type: string description: The file’s stored name, including its extension. example: cover.png title: type: - string - 'null' description: >- Alt text or a short description of the file. An upload without one takes the filename. Null when none was recorded. mimetype: type: string description: The file’s media type. example: image/png size: type: integer minimum: 0 description: The file’s size in bytes. url: type: string description: Where to download the file. thumbnail_url: type: - string - 'null' description: A smaller preview of the file. Null when it has none. created_at: type: string format: date-time description: When the file was stored. required: - object - id - name - title - mimetype - size - url - thumbnail_url - created_at description: A file the community stored, uploaded or generated. securitySchemes: Bearer: type: http scheme: bearer bearerFormat: Tightknit API key description: 'A Tightknit admin API key, sent as `Authorization: Bearer `.' ```` ## Related topics - [Retrieve a message](https://docs.tightknit.ai/v1/api-reference/messages/retrieve-a-message.md) - [Retrieve a pinned message](https://docs.tightknit.ai/v1/api-reference/feeds/retrieve-a-pinned-message.md) - [List message attachments](https://docs.tightknit.ai/v1/api-reference/messages/list-message-attachments.md) - [Retrieve a message version](https://docs.tightknit.ai/v1/api-reference/messages/retrieve-a-message-version.md) - [Working With File Attachments](https://docs.tightknit.ai/slack/working-with-file-attachments.md) This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.