Samba shares Intel PC install

I installed Dietpi on an Intel NUC using a Debian image (stock images did not work)
I cannot get Samba shares to work despite replicating (I think) the setup on another RPI running Dietpi
This is my section from smb.conf
[Movies]
comment = Custom Shared Folder
path = /mnt/Movies
browseable = yes
writeable = yes
create mask = 0775
directory mask = 0775
valid users = dietpi
The files are stored on a mounted USB through Device Manager
My Fstab on the pc I’m trying to access the share is;
//192.168.68.64/Movies /mnt/Movies/Videos cifs username=dietpi,password=XXXXXXXXXX,iocharset=utf8,vers=3.0,file_mode=0666,dir_mode=0777 0 0
If I try to mount this I get an error
sudo mount -a
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
I’m obviously missing something somewhere.