Private shares can be viewed on iphone in Files app

in the iOS Files app (the Apple Files app), i switched on access to the WD MyCloud app, and can now access the contents of all my private shares, each of which normally takes a different username/password to access via a computer.

there is no prompt to authenticate when i access the nas via the Apple app. is that because i already have access to my shares from within the wd app ?

seems odd to me that i can use a PIN to lock my wd mycloud app however i can easily ‘map’ and view all my shares from within the apple Files app without any prompt/protection to verify share access privileges …