I have a luks encrypted file in stock Android 4.4.4 that I want to mount to work with. It is located in the internal sd partition (/sdcard). I am able to mount it as root via su without problems.
However, other apps an users see the folder as empty. They can even write and remove files of the folder, so no permission problem. But they cannot see what root sees, nor root sees what the normal users do in the folder.
I tried mounting the encrypted file inside /storage, inside /storage/extSdCard and inside the /sdcard itself, always with the same result.
I'm not sure which data to provide, please ask.