---
title: "Initiate a Multipart Upload"
slug: "initiate-a-multipart-upload-boto3"
tags: ["5.4"]
updated: 2026-10-28T01:54:03Z
published: 2026-10-28T01:54:03Z
canonical: "docs.vastdata.com/initiate-a-multipart-upload-boto3"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Initiate a Multipart Upload

The [create_multipart_upload()](https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.create_multipart_upload) method initiates a multipart upload and returns an upload ID.

After initiating the multipart upload, you then need to [upload all parts](/docs-5-4/docs/en/upload-a-part-in-a-multipart-upload-boto3) and then [complete the upload](/docs-5-4/docs/en/complete-a-multipart-upload-boto3).