Just found a trick, or solution around my most annoyed things since sony z3 xperia days : Sony Music App Center
Backstory
z3 was when i uploaded and "burned/ nero-ed " my physical CD to pc windows xp days , to android nexus/ LG g9/ etc etc then to subsequentlyiPhone.
Sony Music Center was ironically the most comfortable and easy to manage music folder type app.
Fast forward to today, x200U with good DAC inbuilt....its a waste not to transfer from iphone to this phone.
1) Download
https://pc.vivo.com/#/ the macOS or PC
2) Install that software
3) plug in the iPhone via USB cable
4) Using Finder [ because im a macOS user ] , navigate the internal phone --> Apps --> Music Center (sony )
5) plug in the x200U , navigate within the Vivo Office Application
left column will have your phone name x200U
6) Select [ 文件管理 ] --> then [ 手机存储>MusicCenter]
now both iphone and x200 u both should be connected to your laptop , or for my case its macbook air.
why : limited space on the macbook, each and every transfer of 10 folder music albums, i will do the following
7) Copy from iphone [ musice center ] --to--> macbook finder first ( as it doesnt allow me to directly drag and drop to the vivo office suite app )
8) Copy from macbook finder [ temp folder --to--> x200 [ 手机存储>MusicCenter]
Now whilst both are still intact, just check the Music Center on x200 U has the same albums transferred.
and delete from [ macbook Temp folder ] , and thus [ Music Center from iphone ]
Hopefully this helps those at the Sony camp as well.