SendMessageMedia
object
One photo, video, voice note or document; the body becomes its caption (not for voice notes).
storage_key- string
From POST /api/v1/conversations/uploads.
url- string (uri)
mimerequired- string
filename- string
size- integer
Bytes (checked against WhatsApp’s limit).
{
"storage_key": "string",
"url": "https://example.com",
"mime": "image/jpeg",
"filename": "string",
"size": 0
}