How to render a 1080x1920 video in Sony Vegas?

I merged several iPhone 1080x1920 videos (NOT 1920x1080) in Sony Vegas. I want to render them all into one 1080x1920 video for YouTube, but when I try to set a custom format it saves it in 1088x1080 with black borders on the sides no matter what…
Is there any way for me to keep the original quality? Do I have to rotate the video so that it'll be 1920x1080, but then will I be able to rotate it back in place directly on YouTube?

Anyway, thanks a lot for any help!

Added (1). Actually I tried to render it in 608x1080 and it worked. Maybe Sony Vegas just can't render a video with a height higher than 1080?

Try to play with Output Rotation setting in the Project Properties window.
more information in the help (I have not used this)

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