A brief video showing how to build a simple PDF conversion workflow using the workflow components in your SharePoint Online / Office365 environment. Written, step-by-step, installation instructions can be found here.
Before executing your first workflow carry out a single conversion via the user interface. This activates the trial. Without this step your workflows will not work. Please make sure you select the SharePoint 2013 workflow engine when asked as the 2010 one is not supported by SharePoint Online.