He stopped the recording. The software didn't save an MP4. It saved a .wsp file—a wrapped container that looked like corrupted video to any scanner. To play it back, you needed the same portable executable.
Inside was a cheap, black USB stick. No label. No note. Just a single file: Wondershare_DemoCreator_Portable.exe wondershare democreator portable
He plugged it into his air-gapped tablet. He stopped the recording