Videos on my s20 note are choppy. I have tried soft reset reset settings hard reset and installed latest update. Nothing works. I tried samdung support and they wanted me to send the phone off for repair which I don't want to do as its my only phone. So disappointed in samsung such an expensive phone to be having issues like this.
What video are you talking about? The one you recorded? What's the video specs?
Actually, if you record videos in 4K or higher resolution at 60fps or 120fps, there is a big possibility that you can't play it smoothly on your phone. That's because while some phones claim to support 4K, it doesn't do the job as smoothly as hardware on a computer.
So, if you insist on playing 4K/8K video on your phone, you can lower the resolution or adjust other parameters using WinX Video Converter for example.