Replying to @BrandonSweats @YtBxilds
Unfortunately, you can't upload a custom thumbnail via mobile devices. That is still a desktop-only feature. You can always share your thoughts by using our 'Send Feedback' tool to submit the suggestion, here's how: https://goo.gl/WdI0BK . Hope this helps!
11:01 AM - 16 Dec 2018
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