Open presentation in Keynote on a Mac or iPad.You can absolutely do this with an iPhone as the remote controller and either an iPad or a Mac computer as the presentation device As long as you open the PowerPoint presentation in Apple’s keynote app. (Note: this isn't the 'Smart' keyboard that physically connects to iPad Pro.) Carrying the wireless keyboard around is not as cumbersome as it may sound, and I generally just set it on a nearby desk wherever I was speaking, which was vastly preferable to being stuck within reach of the iPad. So here's what I figured out: You can pair an Apple wireless 'Magic' keyboard to the iPad, then use the arrow buttons on the keyboard to advance the Powerpoint as you walk around the room. But there was no way to control the presentation remotely (from iPhone or other remote), unless I converted the Powerpoint to Keynote, which I was not willing to do because the conversion was messy and made unwanted changes/substitutions.
I taught a six-week class this past winter and wanted to host Powerpoint presentations from my iPad mini, which was tethered to the projection setup with a Lightning-to-HDMI cable. I have tussled with this as well and found a work-around solution you may find acceptable.
