This transfers the `file` (either a local path, S3 file reference, or Javascript `Buffer`) as an "attachment". This is a convenience method that combines `attachment()` and `sendFile()` to prompt the user to download the file. This method optionally takes a `filename` as a second parameter that will overwrite the "filename=" parameter of the `Content-Disposition` header, otherwise it will use the filename from the `file`. An optional `options` object passes through to the [sendFile()](#sendfilefile--options--callback) method and takes the same parameters. Finally, a optional `callback` method can be defined which is passed through to [sendFile()](#sendfilefile--options--callback) as well.
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