Which of the following is not a step in creating a Canvas App?

Creating a Canvas App in Salesforce involves specific steps tailored to integrate external applications within the Salesforce interface. Defining a Database Schema is not a part of the Canvas App creation process. Instead, a Canvas App primarily focuses on providing a user interface that communicates with external services rather than defining internal database structures.

The essential steps in creating a Canvas App include providing a Callback URL and a Canvas App URL, both of which are critical for the integration and functionality of the app. Additionally, selecting OAuth scopes is necessary for controlling the access permissions between Salesforce and the external application, ensuring secure interactions. Therefore, while database schema is crucial for backend data organization, it does not directly pertain to the process of creating Canvas Apps, which emphasizes frontend integration and interaction with external applications.