App Store Connect Video Rejected? Here's Why (and the Fix)

Updated 2026-07-18

If App Store Connect won't accept your App Preview video, it's almost always one of four problems: wrong resolution, wrong duration, wrong codec, or a file that doesn't match the orientation you selected. Here's how to tell which one you hit and how to fix it.

Wrong resolution

This is the most common rejection, usually surfaced as an error along the lines of "the video dimensions are not supported." App Store Connect checks the exact pixel dimensions of your file against the device you're uploading for — it does not resize, crop, or letterbox anything for you. A screen recording from a real device or simulator is almost never the right size out of the box.

If your recording is even a few pixels off in either dimension, the upload is rejected. There's no tolerance. See the full resolution table for every device to check yours.

Wrong duration

App Preview videos must be 15 to 30 seconds long. Shorter clips need padding or a slower edit; longer clips need to be trimmed. App Store Connect rejects anything outside that window, including a video that's 31 seconds by a fraction of a second — you'll typically see an error about the video duration not being supported.

Wrong codec

The file must be H.264-encoded. Screen recordings exported as HEVC (H.265), ProRes, or other codecs from editing software will fail here even if the resolution and duration are correct, usually with an error about the video format not being supported. Re-encoding to H.264 fixes this.

Wrong orientation for the device

Mac, Apple TV, and Vision Pro only accept landscape video — there's no portrait option for these devices in App Store Connect. If you recorded in portrait and are uploading for one of these, the file will be rejected regardless of resolution, because the target frame is always landscape for these device classes.

The fast way to fix it

Re-encoding video by hand with the right resolution, duration, and codec for each device is tedious to get exactly right. PreviewASO Screen takes any screen recording, lets you trim it to 15–30 seconds in the browser, and exports an H.264 file at the exact resolution App Store Connect expects for the device you pick — so the next upload is accepted on the first try. The first conversion each day is free.