for me it works !
did you understand how adoptable storage works ??? no, then read this!
Q&A for enthusiasts and power users of the Android operating system
i did the following and it works for me:
1. format your inserted SD-Card in the Tab A7 and dismount the SD-card after formatting
2. enable USB-debugging and connect with adb console to Tab A7
3. enter the following commands
sm list-disks adoptable
i got the result
my SD-card is 128GB size and i want 32GB (25% of total SD-Card)
for use as internal adopted storage
therefore i want 96GB (75% of total SD-Card) as external SD-card
to do this use the following commands (as adviced in posting #12)
sm set-force-adoptable true
sm partition disk:179,32 mixed 75
sm set-force-adoptable false
then i rebooted my Tab A7 and mounted the external SD-card (which shows 86,9GB)
the internal storage shows two items
1. internal storage 32GB
2. SD-Card adopted storage ( it doesnt tell you the adopted storage size but
it says 100GB used out of 128GB) which means 28GB are free for further usage,
at this point i have moved already all apps which are moveable to external storage.
View attachment 5261485
i use the app "AppMgr III" as App 2 sd - utility
there are no errors or other problems after rebooting or during normal use.
it just works