Short answer:
If Apple Mail is not showing Xink signatures, ensure the iCloud Drive setting in Xink matches your macOS Mail iCloud configuration.
Summary: If Xink signatures are missing in Apple Mail after installation or update, the issue is often caused by a mismatch between macOS iCloud Mail settings and the Xink app configuration.
Check your iCloud Mail settings in macOS
If you are using Apple Mail, verify whether the app is using iCloud:
Open System Settings:

Open the Apple ID section:

Select iCloud:

Locate Mail in the list of apps:

Match the Xink iCloud setting
In the Xink app under Preferences, the setting "I'm using iCloud Drive" must match your macOS Mail configuration:
- If Mail is OFF in iCloud:
Disable "I'm using iCloud Drive" in Xink.
- If Mail is ON in iCloud:
Enable "I'm using iCloud Drive" in Xink.
Next steps
After updating the setting:
- Click Update signatures in the Xink app
- Open Apple Mail and verify that your signatures appear
