> 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.