To fix SMB file sharing issues after updating to macOS 27, reset your file sharing list and re-add the missing directories and drives.
The macOS 27 upgrade may have broken or unbound previously shared folder permissions during the upgrade process.
How to Fix SMB Access on macOS 27:
Disable and Clear File Sharing:
- Open System Settings on your Mac.
- Click General in the sidebar, then click Sharing.
- Turn Off File Sharing
Remove and Re-add Shared Folders/Drives:
- Click the Info (i) button next to File Sharing.
- Select your shared folders (such as Desktop, Documents, Downloads) or attached external drives in the Shared Folders list, and click the minus (–) button to remove them.
- Click the plus (+) button to re-add each folder or external drive.
- Ensure user permissions for each item are set to Read & Write (or your preferred access level).
Re-enable File Sharing:
- Turn File Sharing back On.
- Click Options and make sure your user account is checked under Share files and folders using SMB. Re-enter your account password if prompted.
Reconnect from iPadOS / iOS:
- Open the Files app on your iPad or iPhone.
- Tap the three dots (...) at the top right of the Browse sidebar and select Connect to Server.
- Enter your Mac's local IP address or hostname (smb://...) and sign in using your Mac username and password
More info from Apple: Set up SMB file sharing on Mac - Apple Support
