To get the snapshot with high quality, it is suggested to take the snapshot during the preview in the media library.
Here are the steps to figure it out.
Step 1 Import the original files to the media library.
Step 2 Right-click on the video in the media library then hit “playback” to preview the window, as below.
Step 3 During the preview, you can take the snapshot as you want, see below.
After that, the snapshot will be shown automatically in the media library.
You also can right-click on the snapshot then hit “find target” to find the path where it is saved automatically on your pc, see below.