Freeing up space · One-tap clean-up (Run Tuhi)
What does the "Tidy large folders & clear caches" step of Run Tuhi do?
Short answer: It moves folders your rules already match to your fast drive, leaving links behind, then clears well-known app caches. It doesn't choose new folders by itself.
It's the Free Up Space engine running as part of Tuhi: it moves folders that your rules already match to your fast drive, leaving links behind so they still open from the same place, and then clears well-known app caches.
It only moves what your rules cover — it doesn't pick new folders on its own — and if your fast drive isn't connected, the moving part has nowhere to go. To see or change which folders your rules match, see the Moving folders FAQ.