> For the complete documentation index, see [llms.txt](https://onestopconcept.gitbook.io/open-endpoints/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onestopconcept.gitbook.io/open-endpoints/configuration/data-source-transformation/writing-transformation-input-output-to-aws-s3.md).

# Writing Transformation Input/Output to AWS S3

There is the possibility of adding instructions to output the input/output of the transformation to AWS S3.

```
<transformer data-source="spheres-fo">
  <write-input-to-aws-s3>
    <folder>foo/bar</folder> <!-- optional -->
    <tag name="foo">bar</tag> 
    <tag name="abc">def</tag> 
  </write-input-to-aws-s3>
  ...
  <write-output-to-aws-s3> 
    ...
  </write-output-to-aws-s3>
</transformer>
```

This creates objects in the S3 bucket which have the tags as specified, the correct Content-Type, and in addition a tag called "environment" which is either "preview" or "live".