Look up message by attachment

curl --request POST \
  --url https://api.fluxer.app/v1/admin/messages/lookup-by-attachment \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "channel_id": "<string>",
  "attachment_id": "<string>",
  "filename": "<string>",
  "context_limit": 50
}
'

{
  "messages": [
    {
      "id": "<string>",
      "channel_id": "<string>",
      "author_id": "<string>",
      "author_username": "<string>",
      "author_discriminator": "<string>",
      "content": "<string>",
      "timestamp": "<string>",
      "attachments": [
        {
          "filename": "<string>",
          "url": "<string>"
        }
      ]
    }
  ],
  "message_id": "<string>"
}