This isn't a feature yet, but please file a feedback report with these steps: https://goo.gl/1ckkO5 ? We review all the feedback sent to us, but YouTube doesn't necessarily respond to every single one. We use the info to track requests and make improvements.
@TeamYouTube Is it possible to add clips to a video with the YouTube editor? Or can you only remove clips?
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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