Unlike image files, files stored in BinaryFile or Media Fields may be limited to certain user rolesUser Roles. As such, they are not publicly downloadable from disk, and are instead served by Symfony, using a custom route that runs the necessary checks. This route is automatically generated as the url property for those Fields values.

...

• version: the version number that the file must be downloaded for. Requires the versionview permission. If not specified, the published version is used.
• inLanguage: The language the file should be downloaded in. If not specified, the most prioritized language for the siteaccess will be used.

...