I don't know if this will work, but have you tried rotating the video on your phone, saving it, then uploading the rotated video?
I have a Samsung S23 & within the video there is the edit button & within that is a rotate & or crop button. I just rotated a video, but I didn't upload it to FB, but it seems like it would work.
Let me know if this suceeds, or if you have any questions about my answer.
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