A very basic tutorial on how to edit video thumbnails in Windows 10.
- Download and install Mp3Tag (or use the portable version)
- Open Mp3Tag and drag-and-drop the video you wish to edit into the file list.
- Select the video in the file list.
- Drag-and-drop the thumbnail you wish to use for your video.
- Press save and then you are done.
Take a look at the video below: