Go to lms_flutter_app > images folder.
Replace logo.jpg with your app logo. Keep the file name logo.jpg and the image must be a jpg image.
Now run these two command inside lms_flutter_app folder

flutter pub get
flutter pub run flutter_launcher_icons:main

 

Go to lms_flutter_app > images folder.
Replace logo.png with your app logo. Keep the file name logo.png and the image must be a png image.

Go to lms_flutter_app > images folder.
Replace Splash.png with your app logo. Keep the file name Splash.png and the image must be a png image.

After doing all these, run this command.

flutter pub get