For your videos to be uploaded without black bars, they should be in the ratio of 16:9 as YouTube uses different video aspect ratios based on the platform and video format. Here's more info: https://goo.gl/LiAb5m . Hope it helps!
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I didn't upload this, it's from
@MKBHD. There aren't black bars, I checked on my computer. I'm simply unable to zoom to fill. The app adds these bars on its own - 3 more replies
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Nice
@MKBHD videoThanks. Twitter will use this to make your timeline better. UndoUndo
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