Sending images and other media
--file is for text bodies only. To deliver an image, document, video, or audio file as a native platform attachment, reference it inside the message text with the MEDIA:<local_path> directive:
By default, image files are sent as photos (platforms like Telegram recompress these). Add [[as_document]] to the message to deliver them as uncompressed file attachments instead:
Examples:
From the official Hermes Agent CLI reference.