> ## Documentation Index > Fetch the complete documentation index at: https://docs.eachlabs.ai/llms.txt > Use this file to discover all available pages before exploring further. # Create Presigned Upload URL > Create a short-lived presigned URL for uploading media files. Upload the raw file bytes to `presigned_url` using every header returned in `required_headers`, then pass `public_url` as a model input. ## OpenAPI ````yaml /openapi_specs/models.json post /v1/upload/presign openapi: 3.0.3 info: title: each::labs Official API v1 description: > Official each::labs API V1. This API provides access to our comprehensive AI model catalog and other resources. ## Public contract notes - Public API routes handled by request logging include `X-Request-Id` for support and log correlation. Clients may send `X-Request-Id`; otherwise api-service generates one. Root, health, and metrics endpoints are excluded. - REST error bodies keep the backward-compatible JSON shape used by existing clients. Most errors include at least `error`; some shared error paths also include `status` and `details`. Use the HTTP status code as the primary programmatic signal unless an endpoint documents a richer envelope. - Rate-limit and retry headers are endpoint-dependent. If a response includes `Retry-After`, honor it before retrying; otherwise use bounded exponential backoff for retryable 429/5xx responses. - api-service exposes single workflow trigger through `/v1/workflows/trigger/{workflowID}/{versionID}`. Bulk workflow trigger is not routed through api-service; use the workflows-engine public API directly where bulk trigger is required. version: 1.0.0 contact: name: API Support email: support@eachlabs.ai x-logo: url: ./logo-white.svg altText: each::labs servers: - url: https://api.eachlabs.ai description: Production server security: [] tags: - name: AI Models description: Endpoints for listing and retrieving AI models and other resources. - name: AI Models Prediction description: Endpoints for managing model predictions - name: Uploads description: Endpoints for uploading files that can be used as model inputs. - name: Executions description: Endpoints for listing execution history. - name: Workflows description: Endpoints for triggering workflow executions through api-service. - name: OpenAI Compatibility description: OpenAI-compatible endpoints for LLM Router requests. - name: Webhooks description: > Endpoints for retrieving webhook information and delivery history. **Note:** Currently, webhooks are only supported for Workflows V2. We are actively expanding webhook support to other services and will update this documentation as new integrations become available. paths: /v1/upload/presign: post: tags: - Uploads summary: Create Presigned Upload URL description: > Create a short-lived presigned URL for uploading media files. Upload the raw file bytes to `presigned_url` using every header returned in `required_headers`, then pass `public_url` as a model input. operationId: presignUpload requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/PresignUploadRequest' example: content_type: image/png file_type: image responses: '200': description: Presigned upload URL created content: application/json: schema: $ref: '#/components/schemas/PresignUploadResponse' example: id: 0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0 presigned_url: >- https://eachlabs-storage.s3.amazonaws.com/uploads/...?X-Amz-Signature=... public_url: >- https://cdn-us.eachlabs.ai/uploads/0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0.png expires_at: '2026-12-08T18:15:00Z' required_headers: x-amz-meta-file-id: 0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '500': $ref: '#/components/responses/InternalServerError' security: - ApiKeyAuth: [] components: schemas: PresignUploadRequest: type: object required: - content_type properties: content_type: type: string description: MIME type of the file to upload example: image/png file_type: type: string description: High-level file category enum: - image - video - audio - other example: image expires_in_seconds: type: integer description: >- How long the stored file is retained before automatic deletion, in seconds. Sets `expires_at` in the response. Defaults to 180 days when omitted; clamped to a minimum of 60 seconds and a maximum of 365 days (31536000). Does not affect the 15-minute upload-URL lifetime. minimum: 60 maximum: 31536000 example: 604800 PresignUploadResponse: type: object properties: id: type: string description: Upload identifier example: 0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0 presigned_url: type: string format: uri description: Short-lived URL for uploading raw file bytes example: >- https://eachlabs-storage.s3.amazonaws.com/uploads/...?X-Amz-Signature=... public_url: type: string format: uri description: Public URL to pass as a model input after upload succeeds example: >- https://cdn-us.eachlabs.ai/uploads/0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0.png expires_at: type: string format: date-time description: >- When the stored file is automatically deleted (its retention deadline). Defaults to 180 days out; controlled by `expires_in_seconds`. Not the upload-URL deadline — the presigned URL only accepts uploads for 15 minutes after issuance. example: '2026-12-08T18:15:00Z' required_headers: type: object description: Headers that must be sent verbatim with the upload PUT request additionalProperties: type: string example: x-amz-meta-file-id: 0dce0f44-b8a5-4f30-91d4-5f6b0c221bf0 Error: type: object description: > Backward-compatible REST error body. Endpoint-specific handlers may return only `error`; shared error paths may also include `status` and `details`. properties: status: type: integer description: HTTP status code, when returned by the shared error handler. example: 400 error: type: string description: Safe user-facing error message. example: error message details: nullable: true description: Optional validation or request details for client errors. required: - error responses: BadRequest: description: Bad request headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: slug parameter is required Unauthorized: description: Authentication required or invalid credentials headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: Invalid or missing API key InternalServerError: description: Internal server error headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/Error' example: error: 'Failed to fetch models: internal error' headers: RequestId: description: >- Request correlation ID. Echoes the incoming `X-Request-Id` header or a generated ID. schema: type: string example: 123e4567-e89b-12d3-a456-426614174000 securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: API key for authentication ````