Troubleshooting & messages · Moving, offloading and restoring apps
Why does it say the in-use check ran out of time on a large folder?
Short answer: The in-use check timed out on a large folder, so Storage Studio can't confirm nothing is writing to it. Quit apps that use it and click Check again.
Storage Studio checks whether any app is writing to a folder before moving it. On a very large folder that check can run out of time. That means it doesn't know whether something is writing to it — not that nothing is.
Quit anything that uses the folder, then click Check again, or continue if you're certain nothing is using it.