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Round-5 on-device findings: - VK Android's DownloadFile hangs regardless of Content-Length and Range/206 (PNG stalls ~80%, GCG at 0%) — the download route is abandoned there: the PNG opens in VK's native image viewer (VKWebAppShowImages — its save works on-device) and the GCG returns to the clipboard copy (the pre-URL route, always solid). VK iOS keeps VKWebAppDownloadFile (verified perfect); the desktop iframe keeps plain anchor downloads. - The iOS share sheet no longer carries a title: iOS pasted the 'game-<hash>.png' filename as accompanying text next to the image.