Thanks for reaching out. To clarify, the end screen tool only supports videos with an aspect ratio of 16:9. If your videos aspect ratio is more than this, you may get an option to add end screens. Hope this helps.
@TeamYouTube Dear YouTube Team can you fix this is happening on my video Red Dead Redemption 2 Walkthrough Gameplay Campaign Episode 49 Welcome to the New World.pic.twitter.com/UcaosvYguw
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I recorded that video in Elgato software how can it do that.
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