[timrsc]

Is there a way to switch from letting mobile sheets make copies of files using the default location to using my own file storage without losing annotations?

I'm managing several large libraries.  When I first set them up I let Mobile Sheets use the default storage.  Now I find that my life would be much easier if I could manage my own storage. 

I want to shift from

// Default Mobile Sheets layout
<Mobile Sheets LocalState>:
├───SONG_NAME_1 - INSTRUMENT_1
│      SONG_NAME_1 - INSTRUMENT_1.pdf
│      SONG_NAME_1.mp3
│
├───SONG_NAME_1 - INSTRUMENT_2
│      SONG_NAME_1 - INSTRUMENT_2.pdf
│      SONG_NAME_1.mp3
│
├───SONG_NAME_2 - INSTRUMENT_1
│      SONG_NAME_2 - INSTRUMENT_1.pdf
│      SONG_NAME_2.mp3
│
├───SONG_NAME_2  - INSTRUMENT_2
│      SONG_NAME_2 - INSTRUMENT_2.pdf
│      SONG_NAME_2.mp3


to

// My layout in a folder that I manage.
<Folder that I manage>:
├───INSTRUMENT_1
│      SONG_NAME_1 - INSTRUMENT_1.pdf
│      SONG_NAME_2 - INSTRUMENT_1.pdf
│
├───INSTRUMENT_2
│      SONG_NAME_1 - INSTRUMENT_2.pdf
│      SONG_NAME_2 - INSTRUMENT_2.pdf
│
├───mp3
│      SONG_NAME_1.mp3
│      SONG_NAME_2.mp3

Is this possible?

I would just copy the files and re-import them as a new library, but I have too many annotations that I can't afford to lose.

[timrsc]

Alternatively, 

If I create a new fresh library in the new directory structure, and can map songID from Database1 to songId in Database2... 

Can I copy my annotations from one database to another by copying these tables... 

AnnotationPoints
AnnotationBase
Layers

... correcting the songID for the new database?

Or am I asking for problems due to corrupt schema relationships I don't understand?