curl --request POST \
  --url https://api.scribe-mail.com/v1/assets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "asset": {
    "file_base64": "<string>",
    "filename": "<string>",
    "source_url": "<string>",
    "name": "<string>"
  }
}
'

{
  "data": {
    "id": "<string>",
    "name": "<string>",
    "in_use": true,
    "signature_template_count": 123,
    "file": {
      "url": "<string>",
      "filename": "<string>",
      "content_type": "<string>",
      "byte_size": 123
    },
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z"
  }
}