---
title: "Add a chunk to an existing chunked upload."
method: PUT
path: "/v2.1/accounts/{accountId}/chunked_uploads/{chunkedUploadId}/{chunkedUploadPartSeq}"
tags: ["ChunkedUploads"]
---

# Add a chunk to an existing chunked upload.

`PUT /v2.1/accounts/{accountId}/chunked_uploads/{chunkedUploadId}/{chunkedUploadPartSeq}`

Adds a chunk or part to an existing chunked upload. After you use the Create method to initiate a new chunked upload and upload the first part, 
use this method to upload subsequent parts.

For simplicity, Docusign recommends that you upload the parts in their sequential order ( 1,2, 3, 4, etc.). The Create method adds the first part and assigns it the `sequence` value `0`. As a result, Docusign recommends that you start with a `sequence` value of `1` when you use this method, and continue uploading parts contiguously until you have uploaded the entirety of the original content to Docusign.

Example:


```
PUT /v2.1/accounts/{accountId}/chunked_uploads/{chunkedUploadId}/1
PUT /v2.1/accounts/{accountId}/chunked_uploads/{chunkedUploadId}/2
PUT /v2.1/accounts/{accountId}/chunked_uploads/{chunkedUploadId}/3
```

**Note:** You cannot replace a part that Docusign has already received, or add parts to a chunked upload that is already successfully committed.

## Path parameters

- `accountId` string, required
- `chunkedUploadId` string, required
- `chunkedUploadPartSeq` string, required

## Request body

- ChunkedUploadRequest — This is the request object for uploading a chunked upload.
  - `chunkedUploadId` string — The ID of the chunked upload. **Note:** This property is ignored in requests, and overridden with an auto-generated value in responses.
  - `data` string — A base64-encoded representation of the content that is used to upload the file. Maximum size: 50 MB. However, data is also subject to REST API limits regarding request sizes, and Internet Information Systems (IIS) might place further constraints on file size.

## Response `200`

Successful response.

## Other responses

- `400` — Error encountered.

---

[API](https://skmtc.net/docusign/apis/docusign-esignature-rest-api.md) · [All operations](https://skmtc.net/docusign/apis/docusign-esignature-rest-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/docusign/docusign-esignature-rest-api/versions/77f1998c313d/schema)