Troubleshooting & messages · Free space and clean-up messages
What does "Storage Studio only clears cache folders, and this isn't one any more" mean?
Short answer: Storage Studio re-checks every item just before clearing it. This one no longer looks like a rebuildable cache, so it refuses — refresh to see what's still safe.
Between listing an item and clearing it, Storage Studio checks it again. If the folder has changed so it no longer looks like a rebuildable cache — for example, an app now stores real data there, or it was replaced — Storage Studio refuses to clear it.
Refresh the list; it will show only what's still safe to clear.