Avoid using EndNote from cloud-based storage
Important: Do not store or use EndNote libraries directly from cloud-based folders such as Dropbox, iCloud, OneDrive, Box, SugarSync, etc. This can lead to syncing errors or file corruption. If your library is currently saved to a cloud drive (whether compressed or uncompressed), first download or copy it to your computer. Once it's stored locally, you can safely open and use the library without risk.