I have a cell phone magnetic holder which requires a metal plate in the back of the phone. I have the steel plate inside an otterbox case. Will wireless charging be affected by having the metal plate? You would think a big ol’ slab of metal should affect it but does it? Will it also magnetize the metal? This article says it does interfere and so does basic logic, but they do have some recommendations for car cell phone holders for people like me that just need to have the phone displayed while driving.
Five Car Mounts that Won’t Interfere with Qi Wireless Charging iPhones 8 and X