: If the function returns a string, it is treated as a path to an existing file on disk.
: It requires parameters like filename (the name of the file presented to the user) and media_type (the MIME type, such as text/csv or application/pdf ). Implementation Best Practices Download Decorator
In the Shiny for Python framework, the @render.download decorator registers a function to handle a user-initiated download. : If the function returns a string, it
: For temporary files or large data, the function can yield strings or bytestrings, allowing the app to clean up resources after the download completes. Download Decorator