Does Continuity Camera support full portrait video on Mac, without cropping a landscape feed?
I want to use my iPhone 17 Pro Max as a portrait camera on an Apple M2 Pro Mac, with full upright 9:16 framing rather than cropping a landscape image. The current operating systems are iOS 27.2 and macOS 27.2.
Using Apple Continuity Camera, the iPhone is locked, stable, and mounted upright with the rear cameras facing the subject. Rotating the phone from portrait to landscape and back does not make the receiving video frame portrait.
This was observed in TikTok LIVE Studio 1.38.0, including after a clean reinstall, and in QuickTime Player. Filling a vertical scene in LIVE Studio only crops the received landscape image. LIVE Studio 1.39.6 is now installed, but has not yet been retested.
For comparison, VDO.Ninja displayed a portrait image from the same phone on this Mac. TikTok Phone Camera via QR also worked in portrait on a physical Windows laptop, although that is a different capture method.
Apple's support article says that the iPhone can be mounted in portrait orientation. Does this mean that Continuity Camera can deliver a full portrait video frame to a macOS app, such as 1080x1920, without cropping a landscape feed? If so, which application or setting supports it? If not, is landscape output an intended limitation or a known issue?
I am asking about frame orientation and aspect ratio, not the Portrait background-blur effect. Please help identify whether this belongs to Continuity Camera, the receiving apps, or an unsupported capture mode.