Moves or transfers say a component is missing
If Storage Studio says its file-moving, cloud transfer or backup engine is missing, that copy of the app is incomplete. Download it again, replace the app, then use the check-again button on the banner.
Storage Studio carries everything it needs to move files, talk to your cloud accounts and make backups inside the app itself — there is nothing extra to install. If a banner says one of those engines is missing, the copy of the app on your Mac is incomplete. Replacing it with a fresh download fixes it, and nothing you've already moved is affected.
What you might see
| Where | Message |
|---|---|
| Data Parking | The file-moving engine is missing from this copy. |
| Remotes & Accounts | The cloud transfer engine is missing |
| Data Transfers | The cloud transfer engine is missing |
| A move in the Moves list | "The file-moving engine is missing from this copy of Storage Studio. Reinstalling Storage Studio restores it; then click Reload Probe on the Data Parking banner." |
| A backup set | "The backup engine isn't available in this build, so backups are paused. Reinstalling Storage Studio restores it." |
While the file-moving engine is missing, Data Parking keeps its move buttons switched off. The banner explains why: "Moves stay off so nothing is copied without its links, tags and attributes." Storage Studio would rather not move anything than move it badly.
Likely causes
- The app was copied or unpacked in a way that left part of it behind.
- Something on the Mac removed or quarantined a file inside the app.
- The download didn't finish.
All three come down to the same thing: this copy of the app is incomplete.
Flowchart outline: How to fix a missing engine
- A banner says an engine is missing
- leads to Quit Storage Studio
- Quit Storage Studio
- leads to Download Storage Studio again from storagestudio.us
- Download Storage Studio again from storagestudio.us
- leads to Replace the app in your Applications folder
- Replace the app in your Applications folder
- leads to Open Storage Studio
- Open Storage Studio
- leads to Click the check-again button on the banner
- Click the check-again button on the banner
- leads to Banner gone?
- Banner gone?
- Yes: leads to Moves and transfers are back on
- No: leads to Contact Support with your diagnostic logs
How to fix it
- Quit Storage Studio.
- Download Storage Studio again from storagestudio.us. See Installing Storage Studio.
- Drag the new copy into your Applications folder and choose to replace the old one.
- Open Storage Studio again.
- Click the button on the banner so it checks again without a restart:
- Reload Probe in Data Parking. When it works you'll see "File-moving engine found. Move buttons enabled."
- Re-check in Remotes & Accounts.
- I've reinstalled — check again in Data Transfers.
If Data Parking still says "Still missing — reinstall Storage Studio, then try again.", the replacement didn't take. Make sure you replaced the copy in Applications rather than opening a second copy from your Downloads folder.
Storage Studio 4.18 and later need a Mac with Apple silicon. Intel Macs stay on version 4.17.1, so on an Intel Mac download that version (see Apple silicon and Intel Macs).
What stays safe
Reinstalling doesn't touch anything you've already moved. Folders and apps on your external drive stay where they are, and the shortcuts left behind keep working. A move that was refused because the engine was missing never started, so its original is still in place.
Still stuck?
Use Contact Support in the More menu and include your diagnostic logs — see Sharing diagnostic logs with support.
See also: Moving folders safely · Data Transfers · Data Backup · Something's not working: start here