How to make video less mb

A question because when I modify the audio and video bitrate the computer restarts and does not save well? It would be of great help to me, thank you

Yeah, video file sizes can balloon fast. Try tweaking the export settings in CapCut – lower the bitrate a bit; you might not even notice the quality difference.

Your file size (75MB original, 139MB upscaled) is perfectly normal for high-quality video, especially when you jump from 1080p to 4K. To reduce file size, start by lowering the resolution or bitrate in CapCut's export settings, and explore H.265 if available. With a little tweaking, you'll find a size that works for you.