Can't Save but can View

[OOo]

AC68U
Samba On
Permissions set to R/W
FW-Merlin 380.69
Western Digital Storage
WIN 10

I can access storage, view files but when I go to save I get THE REQUEST IS NOT SUPPORTED.

I did recently switch Routers AC68U for AC68P (then upgraded to Merlin). I then plugged Storage back in, turned on Samba, updated users with permissions.

Stumped.

Thx