---
id: troubleshooting.files-changed-while-being-copied
url: https://storagestudio.us/faq/troubleshooting/files-changed-while-being-copied
category: "Troubleshooting & messages"
subcategory: "Moves and copies that didn't finish"
question: "What does \"Some files changed while they were being copied\" mean?"
alt_questions:
  - "files changed while being copied storage studio"
  - "copy couldn't finish cleanly"
  - "file changed as we read it mac"
  - "move failed because app is using files"
short_answer: "An app was writing to the files during the copy, so it couldn't finish cleanly. Your original is untouched — quit the app using the folder and try again."
tags: ["in use", "copy", "move failed"]
related: ["https://storagestudio.us/faq/troubleshooting/folder-in-use-right-now", "https://storagestudio.us/faq/troubleshooting/files-removed-by-another-app-before-copy-finished"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# What does "Some files changed while they were being copied" mean?

An app was writing to some of the files while Storage Studio copied them, so the copy couldn't finish cleanly. Your original is safe and untouched. Storage Studio only shows this message when the copy actually reported changing files — it doesn't guess.

### What to do
1. Quit the app that uses that folder (mail, messaging, browsers, editors and sync apps are common ones).
2. Try the move again.
3. Folders an app is always writing to are often better left in place.

See [the folder is in use](https://storagestudio.us/faq/troubleshooting/folder-in-use-right-now).