Right-click the file and look at "Properties" (Windows) or "Get Info" (Mac). You can often see the exact time it was saved or the device that originally filmed it.
2018 WhatsApp compression was notoriously heavy. Use a tool like Handbrake to adjust the aspect ratio or a basic AI enhancer to sharpen the 6-year-old resolution. VID-20181126-WA0013mp4
Since this is a relic of late 2018, pair it with a quick title card mentioning what was happening then (like the Spider-Man: Into the Spider-Verse hype or the "Thank U, Next" era). 3. Sharing the "Flashback" Right-click the file and look at "Properties" (Windows)