After opting out of SwiftData, this is no longer an issue.

Unable to get this working in a Designed for iPad app on the Apple Vision Pro simulator. Is this supported?

Oh I see, analyze(_:) returns when the video is finished processing.

Sir, this is a Wendy's.

Turns out a simple solution was hiding in plain sight, I just set the gesture recognizer's view frame to the superview frame, since it has a parent scroll view.

Yes sorry, just accepted your answer on the other thread, it worked.

I've filed this as FB9051526. Currently the Swift project is difficult to reason about, as launching it produces about 70 compiler errors. I'm not aware of any other modern Apple sample code or conceptual documentation on how to use AVAssetWriter.

Workaround (if you don't depend on iOS 15 APIs) is to use a Simulator device with a previous runtime like iOS 14.5, CloudKit works there.