This is what I have in my head section of index.html:
<head>
<meta charset="utf-8">
<title>MeasurementProtocols</title>
<base href="/index.html">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="./assets/icons/apple/touch-icon-ipad.png">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link rel="manifest" crossOrigin="use-credentials" href="manifest.json">
<link rel="apple-touch-icon" href="./assets/icons/apple/touch-icon-iphone.png">
<link rel="apple-touch-icon" sizes="120x120" href="./assets/icons/apple/touch-icon-ipad.png">
<link rel="apple-touch-icon" sizes="152x152" href="./assets/icons/apple/touch-icon-iphone-retina.png">
<link rel="apple-touch-icon" sizes="180x180" href="./assets/icons/apple/touch-icon-ipad-retina.png">
<meta name="theme-color" content="#1976d2">
</head>
If I want to add the webpage to homescreen via an Apple device, the iPhone would take a screenshot as icon, although I added the icons to the index.html as apple describes it on: https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html
So what am I missing, or does it not work with having href directed to assets and not the mainfolder?
PWA with Icons don't work with authentication on a Webserver on iOS. Solution is to remove the Authentication.