With widespread school closures, many instructors now face the world of remote teaching.  One of the decisions is going to be how is the lecture material going to be delivered.  In this video linked here, I described a few of the options on how to use the different platforms (Mac, Windows PC and iOS) to produce lecture recording off the screen, such as PowerPoint or PDF reader, with your voice recording.  I personally use an iPad and that works well for my workflow.