The error "The Operation Can’t Be Completed. Couldn't communicate with a helper application” can occur on iPhone or iPad when attempting to save a file to Sync using Apple’s Files app. It indicates that the Files app cannot communicate properly with the Sync mobile app.
This happens if the Sync mobile app needs to be refreshed or reinstalled, or if the file is being uploaded using a method that is not currently supported.
How to fix this:
1. Reinstall the Sync mobile app
Reinstalling the Sync app can refresh the connection between the Files app and Sync.
On your iPhone or iPad, press and hold the Sync app icon.
Tap Remove App, then select Delete App.
Open the App Store.
Search for Sync.com and reinstall the app.
Sign back in to your Sync account.
After reinstalling, try saving the file again.
2. Upload the file directly from the Sync mobile app
Uploading files through the Sync mobile app is the most reliable and supported method on iOS.
To upload a file:
Open the Sync mobile app.
Navigate to the folder where you want to upload the file.
Tap the + (Add) button.
Select Upload files.
Choose the file from your device.
This method bypasses the Files app and uploads the file directly to your Sync account.
Still having trouble? Contact support.
If the issue persists after following these steps, please contact our support team with details about what took place when the error occurred so this can be investigated further.