---
title: "Upload file in chunks"
method: POST
path: "/bynder-public-us-east-1.s3.amazonaws.com/"
tags: ["Step 3A Upload file in chunks"]
---

# Upload file in chunks

`POST /bynder-public-us-east-1.s3.amazonaws.com/`

Uploading a file consists of the following two parts:

**1. Breaking down your file into parts/chunks**

Each part must be at least 5 MB in size, except for the last part. There is no size limit on the last part of your multipart upload. For more information about how Amazon handles parts/chunks, visit [Amazon's website](https://docs.aws.amazon.com/AmazonS3/latest/userguide/qfacts.html).

**2. Sending the chunks to Amazon and registering them with Bynder**

You can repeat these calls until your file has been uploaded completely.

## Upload a chunk

Make a `POST` request to the Amazon upload endpoint you received from calling **Get closest AmazonS3 upload endpoint**. Use `multipart/form-data` to send all of the parameters included in the `multipart_params` of the previous request, plus the additional parameters listed below.

## Response `200`

---

[API](https://skmtc.net/bynder/apis/oauth-2-0.md) · [All operations](https://skmtc.net/bynder/apis/oauth-2-0/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/bynder/oauth-2-0/revisions/bb9efc864ce1/schema)