iCloud & iCloud Photos · Storage Studio and iCloud
Does Storage Studio ask before making my iCloud files online-only?
Short answer: Optimize Cloud Storage shows a confirmation first, and Free up acts only on the file you tap. Run Tuhi's cloud step runs as part of the one-tap routine — safe because online-only never deletes anything.
It depends on how you start it. Optimize Cloud Storage in the More menu (•••) shows a confirmation first — "Optimise iCloud locally?" — explaining that files stay in iCloud and re-download when opened. Free up in Storage Profile acts on the one file you tapped.
Run Tuhi is the one-tap routine, so its Keeping cloud files online-only step runs as part of the run without a separate prompt — tapping Run Tuhi is the go-ahead. It's safe to run that way because online-only never deletes anything.
If you'd prefer to decide case by case, use Storage Profile's Free up buttons rather than Run Tuhi.