Two years ago I bought a Samsung A9+. I was shocked to find out it wouldn't play 4k video from my drones, camcorder or underwater camera. But I just found out somewhat of a solution. The Mavic 3 Pro and Osmo 5 pro both create lrf files, which I think are 720p. The A9+ will play them, but first you have to rename the extention to mp4. So I found out that the Android CX File Explorer will do this easily. First you create a new subdirectory called lrf. Then move all the lrf files into it. Then select all the files, and hit rename. It allows you to type in a new extention, mp4. Then hit done and it will batch rename them. Then you can play them with your preferred player.