---
title: "Initiate Multipart Upload Endpoint"
method: POST
path: "/s3/multipart/initiate"
tags: ["s3"]
---

# Initiate Multipart Upload Endpoint

`POST /s3/multipart/initiate`

Initiate a multipart upload and return the upload_id.

## Request body

- InitiateMultipartUploadRequest
  - `bucket` string, required
  - `object_key` string, required
  - `content_type` string, nullable

## Response `200`

Successful Response

- InitiateMultipartUploadResponse
  - `upload_id` string, required

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.dev/noso/apis/crucible-backend-api.md) · [All operations](https://skmtc.dev/noso/apis/crucible-backend-api/llms.txt) · [OpenAPI document](https://skmtc.dev/noso/apis/crucible-backend-api/revisions/94953390bbd8?raw)