Connect Drive with Cyberduck

Cyberduck is a free, open-source file transfer tool for macOS and Windows. It speaks WebDAV out of the box, has a clean graphical interface, and handles large uploads better than the OS file managers. If Finder or Windows Explorer feel sluggish on big files, Cyberduck is the recommended desktop client.

Verified against Cyberduck's WebDAV protocol docs at docs.cyberduck.io/protocols/webdav.

Before you start

You need a device password. Sync apps get their own one-time password, separate from your dashboard login.

1. Open Sync devices in your TrekMail dashboard.
2. Click + Add new device.
3. Name it (e.g. Mac — Cyberduck).
4. Leave View files and Edit files checked.
5. Click Generate password and copy the password (dsync_...).

Install Cyberduck

• macOS: download from cyberduck.io or brew install --cask cyberduck.
• Windows: download from cyberduck.io and run the installer.

It's free; the donation prompt is optional.

Connect to Drive

1. Open Cyberduck.
2. Click Open Connection in the toolbar (or File → Open Connection…).
3. At the top of the dialog, pick WebDAV (HTTP/SSL) from the protocol dropdown. This is the encrypted variant — Cyberduck warns that the unencrypted WebDAV (HTTP) option sends Basic-auth credentials in the clear, so always pick the HTTP/SSL one for production.
4. Fill in:
   • Server: copy the host portion from the Drive server URL banner on your Sync devices page — it looks like drive.YOUR-DOMAIN (just the host, no https://, no path)
   • Port: 443
   • Username: your TrekMail account email
   • Password: the device password (dsync_...)
   • Path: /dav/files/account/
5. Optional: check Save Password to store it in your system keychain (macOS) or Credential Manager (Windows).
6. Click Connect.

Cyberduck connects and shows your Drive's top-level folders.

Save as a bookmark

So you don't retype the settings:

1. After connecting, open the menu Bookmark → New Bookmark (keyboard shortcut: Command + Shift + B on macOS, Ctrl + Shift + B on Windows).
2. Cyberduck pre-fills everything from the active connection.
3. Give it a friendly name (e.g. TrekMail Drive).
4. Close the bookmark editor.

Now double-clicking the bookmark reconnects you in one click.

Working with files

• Drag files from your desktop into the Cyberduck window — they upload immediately.
• Drag files out to download.
• Right-click → New Folder creates a directory.
• Double-click a file — Cyberduck downloads to a temp location and opens in the default app. Saving uploads the change back automatically (this is the Edit feature, off by default; turn it on in Cyberduck → Preferences → Editor).
• Right-click → Delete moves to Drive's trash.

Cyberduck uses chunked uploads for large files automatically. There's no separate setting and no size cap.

Sync a local folder with Drive

Cyberduck has a built-in Synchronize feature:

1. In the menu bar: File → Synchronize….
2. Pick the local folder.
3. Choose direction: Upload, Download, or Mirror (both ways).
4. Click Continue. Cyberduck shows the diff before applying changes.

For unattended sync jobs, rclone is a better fit — Cyberduck's sync is one-shot, not scheduled.

Troubleshooting

• "Login failed" — use the device password (dsync_...), not your dashboard password. Try regenerating in Sync devices if it still fails.
• "Connection refused" — server is wrong. Use YOUR-DOMAIN only in the Server field, with /dav/files/account/ in the Path field. Don't combine them.
• Some files don't appear after upload — Cyberduck caches; press Command + R on macOS or F5 on Windows to refresh.
• Transfer paused with "insufficient_scope" — your device password is read-only. Create a new one with Edit files checked.
• Disconnected after long idle — Cyberduck auto-reconnects on next click. To prevent disconnects, open Cyberduck → Preferences → Connection and enable Keep Alive.

For broader sync issues, see Drive Sync troubleshooting.