Read-only access to hard drive attached to AX11000 router
I have a 5.5TB WD MyBook 25 external hard drive connected via USB 3.0 to the AX11000. The drive appears correctly in the Storage Status section of Advanced->USB->USB Storage Device, and I have specified a Network/Media Share Name, and have enabled Samba for Windows. I have also enabled File Sharing. I am able to connect to the drive from a Windows 10 client, and map a drive letter, but the drive letter will not allow me to modify the contents of the drive (read only). The properties of the drive (Security tab) show 3 Group/user names (Everyone, S-1-22-1-0, S-1-22-2-0), and the permissions for all 3 users show as Special permissions. If I try to alter the permissions for Everyone, I get an error: "An error occurred while applying security information to Z:\ Failed to enumerate objects in the container. Access is denied." If I try to create a new folder on the drive, or add a file to an existing folder, I get an error message: "Destination Folder Access Denied".
Any ideas as to why I cannot gain write access to this drive?
Thanks,
Murray