> ## Documentation Index > Fetch the complete documentation index at: https://docs.fuseai.com/llms.txt > Use this file to discover all available pages before exploring further. # A download URL for a note's attachment > Returns a presigned download URL for the document attached to a note, together with the stored file name, MIME type and size. The URL is valid for one hour; request a fresh one when it expires. Readable by you and your teammates. A note that has no document answers 404 `ATTACHMENT_NOT_FOUND`, and a note id the hub does not have answers 404 `NOTE_NOT_FOUND`. Errors: - `404` `KNOWLEDGE_HUB_NOT_FOUND` — No hub with that id, it was deleted, or it belongs to another team. - `404` `NOTE_NOT_FOUND` — No note with that id on this hub. - `404` `ATTACHMENT_NOT_FOUND` — The note has no document attached. - `422` `VALIDATION_FAILED` — hubId or noteId is not a 24-character hex id. - `429` `RATE_LIMITED` — More than 30 knowledge-hub/campaign requests in a minute (or 1000 in a day). Knowledge hubs share the campaigns bucket. Requires one of the following token scopes: campaigns. ## OpenAPI ````yaml /openapi.json get /business/knowledge-hubs/{hubId}/attachments/{noteId} openapi: 3.1.0 info: title: Fuse Business API version: 1.0.0 description: >- External API for lists, campaigns, prospect search and contacts. Authenticate with your API token as HTTP Basic. All paths are under /api/v1. servers: - url: https://api.tryfuse.ai/api/v1 description: Production security: - basicAuth: [] tags: - name: Lists - name: Custom columns - name: Smart columns - name: Exports - name: Campaigns - name: Knowledge hubs - name: Analytics - name: Website intent - name: Account - name: Prospect search - name: Campaign steps - name: Scheduled sends - name: Campaign templates - name: Agents - name: Research - name: Company search - name: Saved searches - name: Folders - name: Contacts paths: /business/knowledge-hubs/{hubId}/attachments/{noteId}: get: tags: - Knowledge hubs summary: A download URL for a note's attachment description: >- Returns a presigned download URL for the document attached to a note, together with the stored file name, MIME type and size. The URL is valid for one hour; request a fresh one when it expires. Readable by you and your teammates. A note that has no document answers 404 `ATTACHMENT_NOT_FOUND`, and a note id the hub does not have answers 404 `NOTE_NOT_FOUND`. Errors: - `404` `KNOWLEDGE_HUB_NOT_FOUND` — No hub with that id, it was deleted, or it belongs to another team. - `404` `NOTE_NOT_FOUND` — No note with that id on this hub. - `404` `ATTACHMENT_NOT_FOUND` — The note has no document attached. - `422` `VALIDATION_FAILED` — hubId or noteId is not a 24-character hex id. - `429` `RATE_LIMITED` — More than 30 knowledge-hub/campaign requests in a minute (or 1000 in a day). Knowledge hubs share the campaigns bucket. Requires one of the following token scopes: campaigns. operationId: getKnowledgeHubAttachment parameters: - name: hubId in: path required: true description: >- 24-character hex id of the knowledge hub (from GET /business/knowledge-hubs). schema: type: string description: >- 24-character hex id of the knowledge hub (from GET /business/knowledge-hubs). - name: noteId in: path required: true description: >- 24-character hex id of the note (notes[].id in GET /business/knowledge-hubs/{hubId}). schema: type: string description: >- 24-character hex id of the note (notes[].id in GET /business/knowledge-hubs/{hubId}). responses: '200': description: Success headers: RateLimit-Limit: schema: type: integer description: Requests permitted in the current window. RateLimit-Remaining: schema: type: integer description: Requests remaining in the current window. RateLimit-Reset: schema: type: integer description: Seconds until the current window resets. content: application/json: schema: type: object required: - attachment properties: attachment: type: object required: - noteId - filename - contentType - byteSize - downloadUrl properties: noteId: type: string filename: type: - string - 'null' contentType: type: - string - 'null' enum: - application/pdf - text/plain - text/csv - application/msword - >- application/vnd.openxmlformats-officedocument.wordprocessingml.document - application/rtf - null byteSize: type: - integer - 'null' downloadUrl: type: - string - 'null' format: uri description: Presigned URL, valid for one hour. example: attachment: noteId: 68a1f8509c41d20014b3ee55 filename: positioning.pdf contentType: application/pdf byteSize: 284913 downloadUrl: >- https://kompassai-uploaded-files.s3.us-east-1.amazonaws.com/knowledge-hub-attachments/68a1f8509c41d20014b3ee55-positioning.pdf?X-Amz-Expires=3600&X-Amz-Signature=1f0b4c2d '400': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '402': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '409': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Error content: application/json: schema: $ref: '#/components/schemas/Error' security: - basicAuth: [] components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string param: type: - string - 'null' doc_url: type: - string - 'null' request_id: type: - string - 'null' required: - code - message required: - error securitySchemes: basicAuth: type: http scheme: basic description: >- Your API token (`af_…`) as the Basic-auth username, with an empty password. ````