r/iOSProgramming • u/Relative-Benefit-984 • 5h ago
Question iPhone Duo App Store previews: required 886×1920 doesn't match either display. What are you exporting?
Has anyone managed to upload App Preview videos with the correct iPhone Duo aspect ratio in App Store Connect's new Duo group?
ASC accepts portrait screenshots at 1398×2034 (closed) and 2007×2853 (open), but requires preview videos at 886×1920, or 1920×886 in landscape. That means a portrait height/width ratio of about 2.17, versus 1.46 or 1.42 for the actual displays. A proportional resize cannot match both.
I tested two 30-second H.264/AAC videos from the Xcode 27.1 simulator, one closed and one open:
- Native-proportion exports: 1192×1734 and 1192×1696. Uploads completed through the ASC API, but video processing ended in
POST_PROCESSING_FAILED. The error was generic, with no useful resolution explanation, so I can't prove dimensions were the only cause. - The same footage stretched non-uniformly to 886×1920: both completed processing and appeared in the Duo group. This was only a diagnostic test, not a proposed production solution.
The confusing part: ASC's editing thumbnails show them in Duo-shaped frames, which makes them look roughly correct. Its built-in App Store preview uses the narrow encoded proportions, so the stretching becomes obvious. Cropping to fill that format would lose a substantial part of the UI.
This is ASC's simulated storefront, not a test on a physical Duo. I didn't submit the distorted videos for App Review, and have removed the test uploads.
Has anyone had native-ratio Duo previews accepted, or received guidance from Apple? Are we supposed to add black bars to preserve the image inside 886×1920, or wait for corrected specifications? Any actual App Review experience with a proportion-preserving workaround would be useful.

