How to fix app preview stuck on "Processing" in App Store Connect

Covers the hidden causes of app preview videos getting stuck on 'Processing' or vanishing after save in App Store Connect, ordered from most to least likely. Causes include silently violating spec requirements (resolution, frame rate, missing audio track, wrong duration, unsupported codec, file size), browser-related upload issues (extensions, batching, private windows), network problems (VPNs, DNS), and backlogs on Apple's own processing servers. Includes an ffprobe command to inspect video specs and points to a paid Mac app the author built to auto-fix formatting issues.

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