Heads up for people not familiar with streaming, you can use obs to duel stream youtube live on vertical at the same time as horizontal, the built in option in live studio sucks as it doesn't give proper algorithm reach. There's tutorial online to set it up and you use 2 stream keys at the same time, its a small hastle but you will get used to it.
How To Stream Vertical AND Horizontal to YouTube (OBS Studio)
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