Send a media message to a conversation

curl --request POST \
  --url https://dev.flextell.ai/api/v1/conversations/{id}/messages/media \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form file='@example-file' \
  --form 'message=<string>'

{
  "success": "<string>",
  "data": {
    "status": "<string>",
    "message_id": "<string>",
    "conversation_id": "<string>"
  }
}