Notification image not showing on some devices like Vivo - flutter

I am using FCM and Flutter Local Notification's plugin for displaying notifications. The problem is that the big image in the notification is not visible on all devices, like Vivo. Only the title and body is visible.
Any fix for this?

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App Icon in Remote Notification alert box

I am sending push notification an iOS app using php.
Whenever the push notification is displayed in the iPhone I want to display my App's Icon in the notification.
How this can be done ?

If you are looking for something like below:
It's default behavior of push notification in Lock screen.
You don't need to do anything to display your notification like this.
Image from Google.

The notifications are displayed either as banner or as alert. Your cant set any app icon on the alert and the icon on the banner is automatically taken from your app icon in the bundle.

There are three things a push notification can do:
Display a short text message
Play a brief sound
Set a number in a badge on the app’s icon.
I don't think you can manually set the app icon in push notification message.
Ray Wenderlich did a great tutorial on this. Try this two links:
Part 1: http://www.raywenderlich.com/3443/apple-push-notification-services-tutorial-part-12
Part 2: http://www.raywenderlich.com/3525/apple-push-notification-services-tutorial-part-2

how to make the notification appear on the locked screen of iphone

i am having application in which i am showing notifications .The notifications are displayed properly when my app is in background but the problem is notification does not appear when the iphone screen is locked.Please help me in solving this problem.

This is a user preference that can be activated in the Notifications section of the Settings app. There is no way to control this from within your app.