> ## Documentation Index > Fetch the complete documentation index at: https://docs.moonbase.ai/llms.txt > Use this file to discover all available pages before exploring further. # Add an attachment > Add an attachment to a draft message. You can send either a multipart/form-data request with the raw file content, or a JSON request with a file ID. ## OpenAPI ````yaml POST /inbox_messages/{inbox_message_id}/attachments openapi: 3.1.0 info: title: Moonbase REST API version: v0 servers: - url: https://api.moonbase.ai/v0 security: - bearer: [] tags: - name: Inboxes description: Manage your inboxes, conversations, and messages - name: Collections description: Manage your collections and items - name: Marketing description: Manage your marketing campaigns and forms - name: Activities description: View activities and capture calls - name: Library description: Manage your meetings, files, and notes paths: /inbox_messages/{inbox_message_id}/attachments: post: tags: - Inboxes summary: Add an attachment description: >- Add an attachment to a draft message. You can send either a multipart/form-data request with the raw file content, or a JSON request with a file ID. parameters: - name: inbox_message_id in: path required: true schema: type: string description: The ID of the Message. explode: true requestBody: description: '' required: true content: multipart/form-data: schema: $ref: '#/components/schemas/MessageAttachmentCreateParams' application/json: schema: $ref: '#/components/schemas/MessageAttachmentCreateParams' responses: '200': description: '' content: application/json: schema: $ref: '#/components/schemas/MessageAttachment' examples: Attachment already exists: summary: Attachment already exists value: id: 1CLJt2vAY2dWSPDQt8AQpz type: message_attachment filename: readme.txt size: 24 download_url: >- https://api.moonbase.ai/asset_redirects/1CLJt2vAY2dWSPDQt8AQpz?token=eyJfcmFpbHMiOnsiZGF0YSI6eyJpZCI6IjFDTEp0MnZBWTJkV1NQRFF0OEFRcHoiLCJibG9iX2lkIjoiMUNMSnQydkFIZVJ0WGZqNEJxNXBpRCIsImNyZWF0ZWRfYXQiOiIyMDI1LTAyLTE3VDE2OjAwOjAwLjAwMFoiLCJuYW1lIjoiYXR0YWNobWVudHMiLCJyZWNvcmRfaWQiOiIxQ0xKdDJ2NWFOZDhHNVNHekVhZVZVIiwicmVjb3JkX3R5cGUiOiJNZXNzYWdlIn0sImV4cCI6IjIwMjUtMDItMTdUMTc6MDA6MDAuMDAwWiIsInB1ciI6InJlZGlyZWN0In19--5d7d52ce87afcd22c2dd88a5a6b1c2822764b32b created_at: '2025-02-17T16:00:00.000Z' '201': description: Attachment added. content: application/json: schema: $ref: '#/components/schemas/MessageAttachment' examples: Add an attachment: summary: Add an attachment value: id: 1CLJt2vAY2dWSPDQt8AQpz type: message_attachment filename: readme.txt size: 24 download_url: >- https://api.moonbase.ai/asset_redirects/1CLJt2vAY2dWSPDQt8AQpz?token=eyJfcmFpbHMiOnsiZGF0YSI6eyJpZCI6IjFDTEp0MnZBWTJkV1NQRFF0OEFRcHoiLCJibG9iX2lkIjoiMUNMSnQydkFIZVJ0WGZqNEJxNXBpRCIsImNyZWF0ZWRfYXQiOiIyMDI1LTAyLTE3VDE2OjAwOjAwLjAwMFoiLCJuYW1lIjoiYXR0YWNobWVudHMiLCJyZWNvcmRfaWQiOiIxQ0xKdDJ2NWFOZDhHNVNHekVhZVZVIiwicmVjb3JkX3R5cGUiOiJNZXNzYWdlIn0sImV4cCI6IjIwMjUtMDItMTdUMTc6MDA6MDAuMDAwWiIsInB1ciI6InJlZGlyZWN0In19--5d7d52ce87afcd22c2dd88a5a6b1c2822764b32b created_at: '2025-02-17T16:00:00.000Z' '400': description: '' content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Missing file parameter: summary: Missing file parameter value: type: errors errors: - type: error status: '400' title: Bad Request detail: >- Provide either a 'file' (binary upload) or 'file_id' (library file ID). '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Default: summary: Default value: type: errors errors: - type: error status: '401' title: Unauthorized detail: >- Invalid or missing API key or JWT. You should provide your Moonbase API Key or JWT in the authorization header, in the format: "Authorization: Bearer MOONBASE_API_KEY" '403': description: Forbidden content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Default: summary: Default value: type: errors errors: - type: error status: '403' title: Forbidden '404': description: '' content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Message not found: summary: Message not found value: type: errors errors: - type: error status: '404' title: Not Found '422': description: '' content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Not a draft: summary: Not a draft value: type: errors errors: - type: error status: '422' title: Unprocessable Entity detail: Attachments can only be managed on draft messages. '429': description: Too Many Requests content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Default: summary: Default value: type: errors errors: - type: error status: '429' title: Too Many Requests '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Default: summary: Default value: type: errors errors: - type: error status: '500' title: Internal Server Error '503': description: Service Unavailable content: application/json: schema: $ref: '#/components/schemas/Errors' examples: Default: summary: Default value: type: errors errors: - type: error status: '503' title: Service Unavailable detail: >- The service is temporarily unavailable, please try again later. x-codeSamples: - lang: JavaScript source: >- import fs from 'fs'; import Moonbase from '@moonbaseai/sdk'; const client = new Moonbase({ apiKey: process.env['MOONBASE_API_KEY'], // This is the default and can be omitted }); const messageAttachment = await client.inboxMessages.attachments.create('inbox_message_id'); console.log(messageAttachment.id); - lang: Python source: |- import os from moonbase import Moonbase client = Moonbase( api_key=os.environ.get("MOONBASE_API_KEY"), # This is the default and can be omitted ) message_attachment = client.inbox_messages.attachments.create( inbox_message_id="inbox_message_id", ) print(message_attachment.id) - lang: Go source: "package main\n\nimport (\n\t\"context\"\n\t\"fmt\"\n\n\t\"github.com/moonbaseai/moonbase-sdk-go\"\n\t\"github.com/moonbaseai/moonbase-sdk-go/option\"\n)\n\nfunc main() {\n\tclient := moonbase.NewClient(\n\t\toption.WithAPIKey(\"My API Key\"),\n\t)\n\tmessageAttachment, err := client.InboxMessages.Attachments.New(\n\t\tcontext.TODO(),\n\t\t\"inbox_message_id\",\n\t\tmoonbase.InboxMessageAttachmentNewParams{},\n\t)\n\tif err != nil {\n\t\tpanic(err.Error())\n\t}\n\tfmt.Printf(\"%+v\\n\", messageAttachment.ID)\n}\n" - lang: Ruby source: >- require "moonbase" moonbase = Moonbase::Client.new(api_key: "My API Key") message_attachment = moonbase.inbox_messages.attachments.create("inbox_message_id") puts(message_attachment) components: schemas: MessageAttachmentCreateParams: title: MessageAttachmentCreateParams description: '' type: object properties: file: type: string format: binary file_id: type: string required: [] MessageAttachment: title: MessageAttachment description: >- The Attachment object represents a file attached to a message. You can download the file content via the `download_url`. type: object properties: type: description: >- String representing the object’s type. Always `message_attachment` for this object. type: string const: message_attachment id: description: Unique identifier for the object. type: string filename: description: The original name of the uploaded file, including its extension. type: string size: description: The size of the file in bytes. type: integer download_url: description: >- A temporary, signed URL to download the file content. The URL expires after one hour. type: string format: uri created_at: description: >- Time at which the object was created, as an ISO 8601 timestamp in UTC. type: string format: date-time required: - type - id - filename - size - download_url - created_at Errors: title: Errors description: >- The Errors object is a container that holds multiple Error objects when an API request encounters several validation or processing issues. This allows the API to return comprehensive feedback about all problems encountered in a single response. type: object properties: type: type: string const: errors errors: description: A list of `Error` objects. type: array items: $ref: '#/components/schemas/Error' required: - type Error: title: Error description: >- The Error object represents a single error that occurred during API request processing. It provides detailed information about what went wrong, including a unique identifier, status code, and human-readable descriptions to help developers understand and resolve the issue. type: object properties: type: type: string const: error id: description: A unique identifier for this specific error instance. type: string status: description: The HTTP status code for this problem, as a string. type: string code: description: An application-specific error code string. type: string title: description: A short, human-readable summary of the problem. type: string detail: description: A human-readable explanation of this specific error. type: string source: $ref: '#/components/schemas/ErrorSource' description: >- An object containing more specific information about the part of the request that caused the error. meta: type: object additionalProperties: true required: - type ErrorSource: title: ErrorSource description: >- The ErrorSource object provides additional context about the specific part of an API request that caused an error. It can point to either a field in the request document or a query parameter that contains invalid data. type: object properties: pointer: description: >- A JSON Pointer [RFC6901] to the associated entity in the request document. type: string parameter: description: A string indicating which URI query parameter caused the error. type: string required: [] securitySchemes: bearer: type: http scheme: bearer description: Your Moonbase API key. ````