Hi Jon! Rush is still in its early stages and is intentionally designed for simple, intuitive editing. We do have plans to expand the capabilities of the app but if 4k footage is not prioritized as one of the first improvements made, it's because that's an intense workflow that's more well-suited for experienced editors on Premiere Pro. However, you can request 4k export to be prioritized by the engineering team here: Premiere Rush: Hot (384 ideas) – Adobe video & audio apps Go to that page and scroll down a bit, you'll see it. I upvoted it for you too! Thanks for the awesome question, Caroline
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