Unable to generate thumbnail for public.image using QLThumbnailProvider in macOS app?

By Apple's documentation, QLThumbnailProvider is used to generate thumbnails for custom file types. However i am trying to use it to generate thumbnails for public.image file type and it is not working. So can we override the system supported thumbnailer using QLThumbnailProvider?

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So can we override the system supported thumbnailer using QLThumbnailProvider?

It’s been a while since I looked at this — before the advent of QLThumbnailProvider in fact — but at that time it was impossible to override the built-in support. I wouldn’t expect that to have changed.

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