> For the complete documentation index, see [llms.txt](https://docs.docontrol.io/docontrol-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.docontrol.io/docontrol-user-guide/risk-management/threat-model-coverage/external-collaborator-sharing/slack-playbooks-for-external-sharing.md).
# Slack playbooks for external sharing
To mitigate the risk associated with external sharing in Slack, you can define automated workflows for these use cases:
* [Auto-delete files in externally shared channels](#auto-delete-files-in-externally-shared-channels)
* [Remediate PII sharing in external channels](#remediate-pii-sharing-in-external-channels)
## Auto-delete files in externally shared channels
When someone uploads a file containing sensitive keywords to an external Slack channel, the security team and actor are notified, and the file is deleted.
1. In Workflows, select **Playbooks**.
2. Filter the playbooks according to the Slack app, and select the **Auto-delete files in externally shared channels** playbook.
3. Give an action name.
4. Under the **File shared** event, define the relevant conditions:
* The `is externally shared` condition is **True**
* The `Get file name` condition contains keywords from the default sensitive keyword list.
5. Add any relevant conditions.
6. Customize the Slack message to send to the Security team.
7. Customize the email to send to the actor who shared the file.\
\
The file is automatically deleted from the Slack channel.
## Remediate PII sharing in external channels
When someone shares a file with an external Slack channel and the file contains PII (personally identifiable information), the file is deleted.
1. In Workflows, select **Playbooks**.
2. Filter the playbooks according to the Slack app, and select the **Remediate PII sharing in external channels** playbook.
3. Give an action name.
4. Under the **File shared** event, add any relevant conditions.
5. Customize the PII scan to search for specific keywords (PII labels), such as `bank account number`.
* If the found PII probability is higher than the recommended DoControl probability, the Slack file is deleted from the channel.
* If the PII scan does not find specific keywords, the workflow ends with the success status.
---
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