It took me a while to figure out exactly where to place my phone to get the wireless charging to work for my iPhone 12 Pro Max. As it turns out, if I push it all the way down into the slot it won't charge. If I push it down just far enough that the camera bump is just touching, it will work. But that's hard to keep in place. So, I 3D printed a small piece to fit down inside the slot to prop the phone up at the right height. When I place it in now, I need to give the phone a little horizontal side to side wiggle as I press it back against the pad until the phone indicates it is charging. Not sure why it requires that side to side movement, but it does. Here's some pictures!
Part:
Without it inserted:
Part in position:
Part:
Without it inserted:
Part in position: