Why does Windows 10 File Explorer not show thumbnails for mp4 …
https://superuser.com/questions/1702123/why-does-windows-10-file-explorer-not-show-thumbnails-for-mp4-video-files
WebJan 29, 2022 · If you need to turn on that feature, under View | Options | Change folder and search options, on the View tab, be sure Always show icons... is not selected. In Windows Explorer, choose large, medium or small icon view (by pressing Ctrl Shift n, where n is 1, 2, or 3 ). Voila! Thumbnails are displayed.
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