Why does the preview show "No Access" when "Read/Write" permission has been granted?

Details

You can set file or folder access permission for users or groups. However, the preview may show "No Access" when "Read/Write" or "Read Only" permissions have been granted.

Resolution

When this happens, follow the steps below to check if "No Access" permission has been set.

Go to Control Panel > Shared Folder.
Select the folder and click Edit > Permissions.
Select Local users or Local groups from the drop-down menu, and check if No Access was ticked.

The permission levels are prioritized as: No Access > Read/Write > Read Only. For example, if the permission setting for the local group is Read Only and the permission setting for a local user who belongs to the same group is No Access, then this user's access permission is set as No Access.
The results displayed in the Preview column do not take into account the permissions configured in Control Panel > Shared Folder > Edit > Advanced Permissions > Advanced Share Permissions.

Further reading

How to manage ACL settings on your Synology NAS

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