What’s making previews unreliable?
QWhen I preview a single Adobe Photoshop PSD image, Quick Look works fine, but they’re shown as generic thumbnails when in multiple views. Can I fix this?
by CHARLIE STITT
AQuick Look, responsible for Finder thumbnails and previews of documents, has undergone major change in macOS 15 (Sequoia). While it still supports a broad range of file types, for instance generating thumbnails and previews of common formats including many image types, those requiring third-party generators can’t use the traditional qlgenerators from the past. Previewing multiple documents works fine for the most common formats and types, such as JPEG and HEIC. If it doesn’t work for Photoshop PSD files, there’s nothing you can do to fix it yourself, but you should report it as a bug.