Troubleshooting & messages · Cloud accounts and transfers
What does "Optimising cloud storage didn't finish" mean?
Short answer: Making cloud files online-only stopped early, often because the provider was mid-sync. Your files are safe in the cloud — let syncing finish and run it again.
Storage Studio was turning downloaded cloud files back into online-only files to free space, and it stopped before finishing — often because the provider's app was busy syncing, or a file was open. Your files are safe: making a file online-only never removes it from your cloud account.
Wait until the provider's app has finished syncing, then run it again from More → Optimize Cloud Storage.