QuickTime error: Continuity Camera video not saving to Mac

Immediately after I record a video to my Mac from my iPhone, using Continuity Camera, QuickTime always gives an alert prompt on my Mac that says

The document “Unsaved QuickTime Player Document 2.qtpxcomposition” could not be opened. An unknown error occurred (1718449215)

And then I can't find the video anywhere on my computer. This is with my 2025 MacStudio and my iPhone 15, and both are up to date. There is plenty of space available for the video, and my phone is connected to my computer via USB (wifi doesn't seem to work, and yes, they're both on the same network, but whatever, it's fine).

There is a workaround, where I just use command-shift-5 and record a screen video while Continuity Camera is active. That is far from ideal though, because it creates these enormous 106 Mbit/s videos, and the video quality isn't any better, in fact I think it might actually be worse. I don't understand why Continuity Camera doesn't work in QuickTime like it's supposed to. Is there maybe a 3p app that works better? Or is there a fix?