Start a workflow manually in SharePoint

From Nintex Automation (5.7) onwards there are two different apps for SharePoint. The legacy Nintex K2 for SharePoint: used for SharePoint on-premises and upgraded environments for SharePoint Online, and Nintex Automation for SharePoint: used on new installations for SharePoint Online. From Nintex Automation(5.8) onwards you can migrate your existing SharePoint Online solutions from Nintex K2 for SharePoint to Nintex Automation for SharePoint using the Nintex K2 for SharePoint SPFx migration tool.

You can manually start a workflow from an item in the SharePoint list or library associated with the workflow of the application.