Why does the Timer Step not appear in the Next Steps listing for a Document Workflow Task in Vault?
This is working as designed. The Timer Step in Vault is not available under the configured Next Steps. Normally, it runs when the previous step is completed. Once the Timer Step has an Associated Workflow Task and a chosen Timer Parameter configured, it functions as intended.
For older workflows that already have the Timer Step configured, the Timer Step appears as the Next Step in that workflow as configured before a feature update changed this. This does not affect the previous functionality.
Vault Workflow Documentation: Timer Steps