You have confirmed that your TV is the problem. As far as I know, all modern phones use the rotation flag to differentiate between a portrait or a landscape orientation in a video. There are no settings in a phone to change this. This applies to all android and ios phones that I have seen.
It may be that your TV media player is too old to display portrait videos. There are several fixes for this. Buy a new media player, buy a new smart TV, cast the video from the phone, cast the video from a windows 10 or 11 pc are some of the solutions.
This message was edited 1 time. Last update was at Mar 28. 2023 15:45