Apple Photos Failed To Download Assets For Duplication _best_ Info

If your device is set to "Optimize Storage," it keeps low-resolution thumbnails locally and downloads the full "asset" only when needed. If the download fails due to a poor connection or full storage, duplication will fail.

Lack of space on either your local device or your iCloud account can block the creation of new assets.

Photos edited in much older versions of iOS or macOS (e.g., iPhoto or early Catalina) may have "broken" editing assets that the current system can no longer process. Step-by-Step Troubleshooting 1. Check Basic Connectivity and Storage