Identify the capture tool and completion state
Apple documents File, New Screen Recording in QuickTime as the route that opens Screenshot. Record whether capture was actually started and stopped through those tools. The application window visible before recording is not by itself evidence that a completed movie was saved.
Keep this route separate from recording a camera movie or audio inside QuickTime. Those are other tasks with their own controls. Note whether the missing item is a screen recording, a still screenshot or a different type of media before searching by its expected filename.
Check the selected destination before repeating
Apple’s Screenshot guide places destination choices in Options, including a selected folder through Other Location. QuickTime’s screen-recording guide says an application may open depending on where the recording was saved. The Desktop is therefore not a universal destination for every capture session.
Inspect the current save choice and any location deliberately selected for the completed capture. Apple describes screen recordings as MOV files with names that include the capture date and time. Use that identity when comparing the expected file with another similarly named recording rather than assuming the newest visible movie is the one just captured.
Verify a short permitted sample
If the earlier destination is uncertain, choose a known folder and make a short permitted sample of non-sensitive desktop content. Stop it, open the resulting file and confirm the location. This checks the capture-and-save workflow without repeatedly recording a long programme or including private account screens.
For help, provide the macOS version, capture route, selected Save to destination, stop action and whether an app opened afterward. Keep missing-file discovery separate from a recording that exists but has an audio or playback problem. Those facts make the destination issue concrete and avoid assuming that the screen-recording tool failed because one expected folder is empty.