1. From My Settings, enter Authentication in the QuickFind box, then select Authentication Settings for External Systems.
2. Click New to set up a new connection. ClickEdit to modify an existing external data source.
3. From the External System Definition menu, select “External Data Source.”
4. From the External Data Source menu, select a data source created by your administrator.
5. Set the following options for the authentication protocol required by Box, Google Drive, SharePoint Online, or OneDrive for Business. Authentication ProtocolChoose OAuth 2.0Authentication ProviderChoose the provider created for this data source by your administratorScopeLeave blankStart Authentication Flow on SaveSelect to immediately verify your login credentials with the external data source.When you click Save, the external system prompts you to log in. After successful login, the external system grants you an OAuth token for accessing its data from this org.Redo the OAuth flow when you need a new token—for example, when the token expires—or if you edit the Scope or Authentication Provider fields.
6. Click Save.