Freeing up space · Stopping, undoing and apps in the way
What if the app in the way is stuck on an unsaved-changes dialog?
Short answer: Storage Studio tells you the app is waiting on a save dialog and leaves the choice to you. Save or discard in the app, let it quit, then press Check again.
Storage Studio tells you so and asks you to finish up yourself — it won't wrestle with the dialog for you. Switch to the app, save or discard as you choose, let it quit, then press Check again in Storage Studio's sheet.
Once nothing is holding the folder, the sheet changes to Ready to move and Continue takes you to the review step. See why force quit is hard to reach.