> ## Documentation Index
> Fetch the complete documentation index at: https://docs.indoralabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Upload Signed Part URL

> Generate a signed URL for uploading a specific chunk of a file in a multipart upload session. Requires the file's storage key, UploadId, and the part number. This endpoint is typically called repeatedly until all file chunks are uploaded.



## OpenAPI

````yaml GET /upload/sign-part
openapi: 3.0.1
info:
  title: Indora Labs API
  description: >-
    Comprehensive API for search, ingestion, file ops, redaction, detections,
    audit trail, and case management. All endpoints return strongly-typed JSON
    with explicit field descriptions and examples.
  version: 1.0.0
  license:
    name: Proprietary
servers:
  - url: https://api.indoralabs.com
security:
  - apiKeyAuth: []
tags:
  - name: Search
  - name: Uploads
  - name: Files
  - name: Redactions
  - name: Detections
  - name: Cases
  - name: Audit
  - name: Auth
  - name: Embeddings
  - name: Policy
paths:
  /upload/sign-part:
    get:
      tags:
        - Uploads
      summary: Get a signed URL for multipart upload chunk
      description: >-
        Generate a signed URL for uploading a specific chunk of a file in a
        multipart upload session. Requires the file's storage key, UploadId, and
        the part number. This endpoint is typically called repeatedly until all
        file chunks are uploaded.
      parameters:
        - name: key
          in: query
          required: true
          schema:
            type: string
          description: S3 object key.
        - name: uploadIdS3
          in: query
          required: true
          schema:
            type: string
          description: S3 UploadId from init.
        - name: partNumber
          in: query
          required: true
          schema:
            type: integer
            minimum: 1
          description: Part number to upload (1-indexed).
      responses:
        '200':
          description: Signed URL
          content:
            application/json:
              schema:
                type: object
                properties:
                  url:
                    type: string
                    description: Pre-signed URL.
components:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````