# Page Not Found

The URL `sensitive-data-protection/slack/slack-faqs/alert_message_blocked` does not exist.

You might be looking for one of these pages:
- [Using Policies to Send Alerts](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/send_alerts_using_policies.md)
- [Accessing Your Webhook Signing Key](https://help.nightfall.ai/developer-api/key-concepts/file_scan/webhooks_async_notifications/webhook_signing_key.md)
- [Special File Types](https://help.nightfall.ai/developer-api/key-concepts/file_scan/special_file_types.md)
- [Scanning Images for patterns using Custom Regex Detectors](https://help.nightfall.ai/developer-api/key-concepts/scanning_features/pre_configured_detection_rules/scanning-images-for-patterns-using-custom-regex-detectors.md)
- [Specialized File Detectors](https://help.nightfall.ai/developer-api/key-concepts/file_scan/special_file_detectors.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://help.nightfall.ai/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://help.nightfall.ai/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/developer-api/key-concepts/scanning_features/send_alerts_using_policies.md`)
- Use `Accept: text/markdown` header for content negotiation