The reason why NetEase Cloud Music on Apple phones cannot automatically scan local music files is due to restrictions on music APPs imposed by the Apple iOS system.

In the iOS system, for security reasons, the music APP cannot directly scan local music files and requires users to add them manually. This means users have to manually select and import the local music files they want to play in NetEase Cloud Music. This restriction is to prevent malware or unauthorized music files from entering the device and protect the user's data security and copyright interests. This limitation will bring some inconvenience to users and is also one of the design decisions of Apple’s iOS system.