You can certainly put/send your current MobileSheets database on/to another device, and all annotations, cropping, etc. will also be migrated.
I do this all the time, so that all my tablets have EXACTLY the same database.
I use the companion app on my Windows computer to save the database from the 'donor' tablet, and then 'restore' it on the 'receiving' tablets.
I kinda don't think it's possible to 'export' the .pdfs in their original format but with (only) the annotations included.
YMMV
See my signature line...
I do this all the time, so that all my tablets have EXACTLY the same database.
I use the companion app on my Windows computer to save the database from the 'donor' tablet, and then 'restore' it on the 'receiving' tablets.
I kinda don't think it's possible to 'export' the .pdfs in their original format but with (only) the annotations included.
YMMV
See my signature line...
I could be wrong, it happened once before.