> For the complete documentation index, see [llms.txt](https://docs.nuvolos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nuvolos.com/reference/file-system-and-storage/preview-files.md).

# File preview and editing

The Nuvolos web UI lets you work with the contents of certain file types without starting an Application.

#### Edit files

The web UI supports editing simple text files:

* Plaintext data files (.csv, ...).
* Plaintext files (.txt, .md, ...).
* Source code files (.py, .m, ...).

The file extension does not matter. Click the file name and select **Edit**. If you don't see the Edit option, the file is either too large (greater than 1 MB) or contains data that cannot be decoded to UTF-8.

#### Preview files

Some file types can be previewed in read-only mode without an Application:

* PDF files (.pdf).
* Notebook files (.ipynb).

Click the file name and select **View**. If **View** is not available, previewing is not supported for that file type.


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# 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, and the optional `goal` query parameter:

```
GET https://docs.nuvolos.com/reference/file-system-and-storage/preview-files.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.