---
title: "Upload file in chunks"
method: POST
path: "/"
tags: ["Step 3A Upload file in chunks"]
---

# Upload file in chunks

`POST /`

## Request

- Base URL: `https://bynder-public-us-east-1.s3-accelerate.amazonaws.com`
- URL: `https://bynder-public-us-east-1.s3-accelerate.amazonaws.com/`
- Auth: none required

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.dev/bynder/apis/upload-assets.md) - [All operations](https://skmtc.dev/bynder/apis/upload-assets/llms.txt) - [OpenAPI document](https://skmtc.dev/bynder/apis/upload-assets/revisions/05062b65fc98?raw)