Which of the following is not a capability of UiPath Orchestrator?

UiPath Orchestrator is a powerful tool primarily designed for managing, monitoring, and controlling the execution of automation processes, rather than building them. While running automations in attended mode allows users to interact with their automation directly on their machines, and managing both attended and unattended licenses enables administrators to streamline their licensing strategy, these functions align well with the Orchestrator's role in overseeing operation and resource allocation.

Additionally, the ability to store credentials is especially important in maintaining security and facilitating smooth automation without constantly requiring user input for sensitive data. However, the building of automations is a development function that typically takes place in UiPath Studio, where developers create and design automation workflows. Thus, since Orchestrator does not have capabilities aimed at creating or developing automation workflows, this is why the option related to building automations stands out as the correct answer.