Start a workflow manually in SharePoint

From Nintex K2 Cloud Update 21 onwards there are two different apps for SharePoint Online. The legacy Nintex K2 Cloud for SharePoint app: used for SharePoint upgraded tenants, and the Nintex K2 Cloud (SPFx) app: used for new tenants.

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