Right-click your footage > Interpret Footage > Main . Ensure the frame rate is correct. Do not try to upscale 24fps to 60fps for 4K; keep it native.
. While a free trial is available, the full version requires a license. Compatibility : Works as a plugin for Adobe After Effects Premiere Pro Free Alternatives & Methods
Click (or Height) to instantly fill the 4K frame. Refine Sharpness and Noise : Set Detail to 100% to maximize edge clarity.