What is TF signature? Are you sure you don't want to give up?

The biggest role of TF signature is to let the application be installed on the iPhone instead of on the APP Store, because TF signature is actually placed on the shelf of testflight, another official beta store in Apple. The biggest difference with the App Store is that testflight is the internal testing store of the app, focusing on the internal testing of the app. However, users can still be packaged in this way, so it can replace the App Store to some extent.