I have downloaded various "Dynamic Desktop" wallpapers online, put them into a directory, and added this directory to my Desktop & Screen Saver preference pane.

The problem is, it does not correctly the thumbnails. They all appear to be the "Mojave" wallpaper, while in reality they each are different pictures.

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1 Answer 1


On Mojave the system doesn't generate correct thumbnails. The only workaround is to place the wallpaper into /Library/Desktop Pictures/ and place its thumbnail into /Library/Desktop Pictures/.thumbnails/ folder. This requires administrator password and can only be performed from terminal.

sudo cp mywallpaper.heic /Library/Desktop\ Pictures/
sudo cp mywallpaper_thumbnail.heic /Library/Desktop\ Pictures/.thumbnails/mywallpaper.heic

Thumbnail has to have same name as wallpaper. macOS Catalina can create correct thumbnail. Custom thumbnails are only supported for wallpapers inside Desktop Pictures folder.

Wallpaper thumbnails

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