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On hover, each thumbnail cycles though its 3 thumbnails. Additional feature to view those 3 thumbnails all at once (non-animated)
< Spätná väzba na YouTube Animated Thumbnails & Preview Videos
Unfortunately, I don't think it's possible. I can only find 3 thumbnails for each video (the three you're able to choose from when you upload a video).
Would it be feasible / useful to use the "storyboard" for the video (i.e. the previews that appear on hovering the time bar)?
They are stored as images with URLs of type https://i.ytimg.com/sb/ZgsByqwaC5k/storyboard3_L2/M0.jpg?sigh=EUjHfyoDHVRU00nhvPAvUh-QIJY and there is another script ( https://greasyfork.org/fr/scripts/10848-youtube-thumbnails-full-video-thumbnails-for-youtube ) that shows these on the video page.
The YouTube Center addon had this feature, but it has not been updated for ages and no longer works.
Please add more preview images
How increase to 4, 5 or 6 animated images? It is possible?