It can handle most sizes but the bigger the file the more chance for an error to happen through the process. I would keep it 720p definition and I keep my thumbnails smaller as well 1280x720 or even smaller than that :) Try different browsers or trying again 10-15 minutes later
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Do you know how to change the definition on a phone (iPhone)? Thanks so much for the info! I hope it works!
It should be in the settings > video
Good luck!