> For the complete documentation index, see [llms.txt](https://docs.reo.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.reo.dev/integrations/output-integrations/data-export/s3-data-transfer.md).

# S3 Data Transfer

To upload files into your S3 environment, we use cross-account IAM role assumption (AWS AssumeRole) from our side. You'll just need to create a role and grant it access to your bucket.

Here's how it works:

1. Reach out to your account manager at Reo.Dev to get the following details we've provisioned on our side:
   * Our **AWS Account ID**
2. In your AWS account, create a cross-account IAM role:
   * Create a new IAM role with a **trusted entity** scoped to our AWS Account ID
   * Attach the **AmazonS3FullAccess** policy (or a scoped policy with `s3:PutObject` on the target bucket)
   * Share the **Role ARN** and **bucket name/prefix** back with us

Once we have the Role ARN and bucket details, we'll run a test upload to confirm everything is working correctly.

Feel free to reach out to your account manager or drop us an email at <support@reo.dev> in case you hit any blockers.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.reo.dev/integrations/output-integrations/data-export/s3-data-transfer.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.