It depends on how you took the video, if you took the video with the phone in vertical (this is call vertical video) then when you upload the video it will be a vertical video. Try taking the video again but with the phone horizontally, this will fill the display even if you upload it to any website.
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It depends on how you took the video, if you took the video with the phone in vertical (this is call vertical video) then when you upload the video it will be a vertical video. Try taking the video again but with the phone horizontally, this will fill the display even if you upload it to any website.