How to set alert sound for GPS tracker and car alarm commands on iPhone 17 Pro Max?

You cannot directly change the notification alert sound for individual third-party apps within the iOS main settings menu. Apple manages notification sounds globally, meaning third-party apps either use the system Default Alert sound or rely on their own internal settings. 

If the app lacks internal sound options, you can take advantage of an updated automation trigger in iOS 27that detects incoming notifications: 

1. Open the native Shortcuts app on your iPhone.
2. Tap the Automation tab at the bottom, then tap the + (plus) icon to create a new automation.
3. Scroll and select the "When I receive a notification" trigger. 
4. Set the parameters:

• • App: Choose your GPS tracker/car alarm app.
  • Text (Optional): If you only want an alert for specific commands (like "Alarm Triggered"), type that phrase here.

1. Set it to run Immediately without asking.
2. In the Actions block, search for Play Sound or Play Media and select a downloaded alarm or siren sound file from your device. 
3. Go to Settings > Notifications > [Your App] and toggle off the default system sound so you only hear your custom shortcut alarm

The settings you are referring to do not exist in iOS 27 they were present in previous versions.

I would really appreciate it if you could write down the detailed steps I need to follow for iOS 27.