Thanks for reaching out! Yes, you can definitely go out of the page and comeback once it's done. It doesn't really take time to upload a video, but if it's over 8+ hours, tweet us back, so we can help.
@TeamYouTube Hey YT my video is stuck at 0% while processing and it says it is queued is it safe to close out of the tab?
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Its ok now after i message ypu i was able to publish on my mobile device
End of conversation
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