Security of files uploaded on private

Hello,

I would like to know if the files uploaded this way in laravel 5.5 are not accessible whatesoever publically by users. Is there any extra protections I should be looking at in order to make sure that this data cannot be accessible from the web(ie: does this folder requires manually to have its CHMOD set or will LARAVEL set it for me).

$request->file('profilePic')->store('avatars', 'private').

I have just done a test, the file uploads fine in the location but I am unsure about the secury of the upload.

Thank you.