Storage on Galaxy J3

[EJB986]

New phone a few weeks old.
Purchased the phone to use mainly as a normal mobile and maps on our travels from Osmand.......so little use as yet.
Use PCs/laptop most of the time.
16Gb of internal storage has dwindled to only 4 Gb available space......I think it was about 9Gb either free or used on purchase
Any maps downloaded have been moved to a 64Gb card I have added.
Only 60Mb of storage shows as user data...and on the 64 Gb card only 90Mb on the added storage although I did assume that the maps were around 2Gb or more.

No other apps can be moved to my added storage.
Is the OS really using 12Gb or have I missed the obvious?
Thank you.

 

[EJB986]

Any comments Please?

 

[Dannydet]

https://m.gsmarena.com/samsung_galaxy_j3_(2016)-7760.php

If you downloaded 2gb of data it should be 2gb of data, period.
Not all apps can be installed to the external storage.
The OS is more than likely taking up about 4gb of system space.
Use a file manager and see exactly what is consuming your space.
SD maid from the play store can help you find out these things.

 

[EJB986]

Downloaded SD Maid.
Two or three scans don't seem to have made any difference.
Now have 12.2Gb used and 3.8Gb free.
On my first post 4Gb was free.
Is this really a normal usage/free space when the phone is hardly used?

 

[dontpanicbobby]

Are you having problems receiving calls!

 

[EJB986]

No, all seems to be working well with no operating problems at all.
When the built in system cleaner is used it goes to 100%.
Info from SD Maid:-
Public storage (Secondary) 100Mb used/60Gb capacity.
Public storage (Primary) storage/emulated/0 74Mb used 11Gb capacity.