You can use the PlayStation 4 DualShock controller on a PS5 — but only when playing PS4 games. However, you can use the PS4 controller with any PS5 game while doing remote play on your phone or tablet ...

The file, described as “a Port of the Official PS4 Remote Play App,” takes advantage of Remote Play, the PlayStation 4 feature that allows users to remotely control their PS4 from a PS Vita handheld ...