API routes for managing attachments.
Creates a new attachment and returns the attachment URL. The file to upload should be sent in the file upload field named file.
Upload attachment success route{
  "alternate_emails": [
    {
      "address": "zebra@grapheffect.com"
    }
  ],
  "primary_email": {
    "address": "chicago@grapheffect.com"
  }
}{
  "alternate_emails": [
    {
      "address": "zebra@grapheffect.com"
    }
  ],
  "primary_email": {
    "address": "chicago@grapheffect.com"
  }
}