CHANGE ICON on Ionic PWA

I have build an Android IONIC PWA with Angular and I have decided to change ICON on my APP I deleted Angular icons in (WWW/Assets/icons) folder and put my new icons in it. It has been succsesfully changed for Android devices but not for IOS devices. After I click “add to homescreen” on my IOS device the icon is just start page of the APP.
Do anybody know how can ICON be shown on IOS or is it not possible because I have build an Android Application?

U should not be changing anything in www folder.

Likely the assets folder should be addressed

I have added the icons in www/assets/icons folder with the same name as the standard Angular icons. And www is the folder which I have uploaded on the internet to make my PWA online.