There seems to be a bandwagon of people saying this app doesn't work at all. As someone who actually downloaded and used it, I want to tell you they're all correct, Apple didn't even try. This was the same issue back when I tried to switch from Pixel 2 XL to iPhone 10, now years later a Pixel 4 still can't transfer 1GB of content to an iPhone 13. Apple's product team has decided the technology to make two phones transfer data is too complicated, I guess.