> ## Documentation Index > Fetch the complete documentation index at: https://docs.usetuner.ai/llms.txt > Use this file to discover all available pages before exploring further. # Start Voice Clip Upload > Start a resumable upload and return presigned PUT URLs for every part. All part URLs are returned up front rather than in batches: they share a single expiry, so batching would add round trips without extending the usable window. Use Get Upload Parts to resume, or to re-sign after the URLs expire. ## OpenAPI ````yaml https://api.usetuner.ai/public/openapi.json post /api/v1/workspaces/{workspace_id}/agents/{agent_id}/voice-clip-uploads openapi: 3.1.0 info: title: My Public API version: 1.0.0 servers: - url: https://api.usetuner.ai security: [] tags: - name: calls x-group: Calls - name: workspaces x-group: Workspaces - name: simulation x-group: Simulation - name: agent-settings x-group: Agent Settings - name: agents x-group: Agents - name: scenarios x-group: Scenarios - name: traces x-group: Traces - name: providers x-group: Providers paths: /api/v1/workspaces/{workspace_id}/agents/{agent_id}/voice-clip-uploads: post: tags: - simulation summary: Start Voice Clip Upload description: >- Start a resumable upload and return presigned PUT URLs for every part. All part URLs are returned up front rather than in batches: they share a single expiry, so batching would add round trips without extending the usable window. Use Get Upload Parts to resume, or to re-sign after the URLs expire. operationId: >- create_voice_clip_upload_api_v1_workspaces__workspace_id__agents__agent_id__voice_clip_uploads_post parameters: - name: agent_id in: path required: true schema: type: integer description: Tuner's internal numeric ID for the agent. title: Agent Id description: Tuner's internal numeric ID for the agent. - name: workspace_id in: path required: true schema: type: integer description: Workspace ID. Find this in Workspace > General Settings. title: Workspace Id description: Workspace ID. Find this in Workspace > General Settings. requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/VoiceClipUploadCreateRequest' responses: '201': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/VoiceClipUploadCreateResponse' '400': description: Unsupported extension, or a declared size above the 200 MB ceiling. content: application/json: example: detail: 'Unsupported extension ''flac''. Allowed: [''m4a'', ''mp3'', ''wav'']' schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Missing or invalid API key. content: application/json: example: detail: Not authenticated schema: $ref: '#/components/schemas/ErrorResponse' '402': description: >- Simulation is not included in the workspace's current plan, or the workspace lacks credits for uploaded-audio analysis. content: application/json: example: detail: Simulation not included in your current plan. schema: $ref: '#/components/schemas/ErrorResponse' '403': description: You do not have access to this workspace. content: application/json: example: detail: User does not have access to workspace 42 schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Agent not found. content: application/json: example: detail: Agent with ID 17 not found schema: $ref: '#/components/schemas/ErrorResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' '503': description: The S3 upload signer is not configured in this environment. content: application/json: example: detail: Audio uploads are not available in this environment. schema: $ref: '#/components/schemas/ErrorResponse' security: - Bearer: [] components: schemas: VoiceClipUploadCreateRequest: properties: filename: type: string maxLength: 512 minLength: 1 title: Filename extension: type: string maxLength: 10 minLength: 1 title: Extension size_bytes: type: integer maximum: 209715200 exclusiveMinimum: 0 title: Size Bytes type: object required: - filename - extension - size_bytes title: VoiceClipUploadCreateRequest description: >- Input schema for starting a resumable upload. `size_bytes` is the client's declared size. It is what the part plan is computed from and what the size gate rejects on; S3 is still the authority on what actually landed. VoiceClipUploadCreateResponse: properties: id: type: integer title: Id status: type: string title: Status filename: type: string title: Filename extension: type: string title: Extension size_bytes: type: integer title: Size Bytes duration_ms: anyOf: - type: integer - type: 'null' title: Duration Ms channel_count: anyOf: - type: integer - type: 'null' title: Channel Count channel_mode: anyOf: - type: string - type: 'null' title: Channel Mode speakers: anyOf: - items: $ref: '#/components/schemas/VoiceClipUploadSpeaker' type: array - type: 'null' title: Speakers failure_reason: anyOf: - type: string - type: 'null' title: Failure Reason created_at: type: string format: date-time title: Created At part_size_bytes: type: integer title: Part Size Bytes parts: items: $ref: '#/components/schemas/VoiceClipUploadPart' type: array title: Parts expires_at: type: string format: date-time title: Expires At type: object required: - id - status - filename - extension - size_bytes - created_at - part_size_bytes - expires_at title: VoiceClipUploadCreateResponse description: >- The create response: the upload plus everything needed to start pushing bytes. ErrorResponse: properties: detail: type: string title: Detail description: Human-readable description of what went wrong. type: object required: - detail title: ErrorResponse description: Error body returned when a request fails. HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError VoiceClipUploadSpeaker: properties: index: type: integer title: Index label: type: string title: Label type: object required: - index - label title: VoiceClipUploadSpeaker description: >- One channel as the picker shows it; the sample's S3 key is never exposed. VoiceClipUploadPart: properties: part_number: type: integer minimum: 1 title: Part Number description: 1-based part index. url: type: string title: Url description: Presigned PUT URL. Treat as a credential; do not log. type: object required: - part_number - url title: VoiceClipUploadPart description: One part of the multipart upload, as offered to the client. ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type input: title: Input ctx: type: object title: Context type: object required: - loc - msg - type title: ValidationError securitySchemes: Bearer: type: http description: >- Use Tuner API key (tr_api_...) or user session token. Find your API key in Workspace Settings > API Keys. scheme: bearer ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.