If you are having ssh set up then you should run below mentioned command on shares and see what result you are supposed to get.
Code:
-ls -l /DataVolume/shares/NAME_OF_YOUR_SHARE
Alos you should create a new user and you should give an access to the private share and connected your device through the new user account and simply put the files into the user account which you are having.
You might need to check the permission setup for the different kind of share to confirm that every single share should not have different permission set.
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