The file widget allows editors to upload a file or select an existing one from the media library. The path to the file will be saved to the field as a string.
*`allow_multiple`: *(default: `true`)* when set to `false`, prevents multiple selection for any media library extension, but must be supported by the extension in use
*`config`: a configuration object that will be passed directly to the media library being
*`media_folder`(Beta): file path where uploaded files will be saved specific to this control. Paths can be relative to a collection folder (e.g.`files`will add the file to a sub-folder in the collection folder) or absolute with reference to the base of the repo which needs to begin with`/`(e.g`/static/files`will save uploaded files to the`static`folder in a sub folder named`files`)