public static attachmentBase64(fileName as String, base64Content as String) as MimeBodyPart
Creates an attachment from Base64 content.
Use this helper when the payload is already available as Base64 text. This is the operational path for binary attachments until byte-oriented file I/O is fully stabilized in the runtime.
import klyn.mails
part = MimeBodyPart.attachmentBase64("archive.bin", "AQID", "application/octet-stream")
print(part.transferEncoding)