Here's a guide to fix iOS 17 Beta wallpaper completely broken bug by restarting the iPhone 14 Pro or updating…
You can set multiple pictures as your wallpaper on your iPhone with iOS 16 with the help of this guide.
Here's a guide on how to find the current wallpaper on Windows 10 and where it is stored.
Looking for abstract, 4K, 5K, wallpapers of iPhone 14 Pro Max, you can download them from here.