Compared with NTFS and FAT32, what is a "universal layered" file system?

Universal layering provides some copyright protection functions, which are the same for most Android and even players.

It can be regarded as the middle layer or VFS. After all, there are many VFS windows in EXT4 format in the mobile phone, and MTP can't read them. VFS is abstract. Windows reads and writes MTP, and the corresponding operations are executed from the device side, much like FTP.