---
title: "Upload a part of an ongoing multipart upload"
method: PUT
path: "/worker/multipart/{key}"
---

# Upload a part of an ongoing multipart upload

`PUT /worker/multipart/{key}`

Upload a single part of an ongoing multipart upload. Parts can be uploaded in parallel and then combined afterwards.

## Path parameters

- `key` string, required

## Query parameters

- `bucket` string, required — The name of the bucket.
- `uploadid` string, required — A unique identifier for a multipart upload
- `partnumber` integer, required
- `minshards` integer
- `totalshards` integer
- `encryptionoffset` integer

## Response `200`

Successfully uploaded part

## Other responses

- `400` — Invalid combination of request parameters
- `404` — Bucket or upload weren't found
- `503` — Consensus isn't synced

## Changes

- **2024-12-09** `f062c35d8f47` — 5 breaking, 6 info
  - for the `query` request parameter `minshards`, default value `10` was removed
  - for the `query` request parameter `totalshards`, default value `30` was removed
  - for the `query` request parameter `minshards`, the type/format was changed from `integer`/`uint8` to `integer`/`uint32`
  - for the `query` request parameter `partnumber`, the type/format was changed from `integer`/`` to `integer`/`uint32`
  - …7 more

[Change history](https://skmtc.dev/siafoundation/apis/renterd-api/changes/worker/multipart/:key/put.md)

---

[API](https://skmtc.dev/siafoundation/apis/renterd-api.md) · [All operations](https://skmtc.dev/siafoundation/apis/renterd-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/siafoundation/renterd-api/revisions/ce856efcdea2/schema)