There are still people who watch downloaded videos on their device. Unfortunately, they will always rotate vertically by default. Immediately flip the video only applications from App Store. Therefore, you will have to change the rotation yourself.
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This is extremely simple to do. To do this, you only need to disable the device orientation lock and turn the phone to one side.
This button is located in the control point, which is called by swiping your finger from bottom to top along the bottom of the screen.
Third-party applications will also help solve this issue, with the help of which the orientation of the video file is forcedly changed. In this case, if the flip of the phone screen is turned off, it will become problematic to watch the video in vertical orientation.