Access to a shared folder required both share permission and NTFS permission.
Managing NTFS Permissions and Share Permissions
If you find working with two separate sets of permissions to be too complicated or time consuming to manage, you can switch to using only NTFS permissions.
Shared folder permissions provide limited security for your folders. Therefore, you gain the greatest flexibility by using NTFS permissions to control access to shared folders.
Moreover, NTFS permissions apply whether the resource is accessed locally or over the network.
To do this, change the share permissions for the folder to “Full Control.”
You can then make whatever changes you want to the NTFS permissions without having to worry about the share permissions interfering with your changes.