With macOS Sonoma and Sequoia, Apple introduced stunning high-framerate aerial screensavers and wallpapers. However, each of these 4K video files is downloaded in the background and stored locally on your SSD.
Located in /Library/Application Support/com.apple.idleassetsd/Customer, these aerial videos can quietly consume 15GB to 30GB if you have multiple dynamic wallpapers active.
XrayMac recognizes these system video asset caches, giving you a safe one-click option to remove inactive 4K wallpaper videos while keeping your current desktop wallpaper active.