My debug smb.conf

smb.conf

#======================= Global Settings =====================================
[global]
   workgroup = WORKGROUP
   server string = jxpryde-arch-think
   netbios name = jxpryde-arch-think

   # Disable Printing
   printcap name = /dev/null
   load printers = no
   disable spoolss = yes
   printing = bsd

   log file = /var/log/samba/%m.log
   max log size = 100000

   security = user
   dns proxy = no

  create mask = 0664
  directory mask = 0775

  force create mode = 0664
  force directory mode = 0775

#========== FOR DEBUG - REMOVE IN PRODUCTION =============

  log level = 10

  username map = /etc/samba/users.map

  ; force NTLMv2
  ntlm auth = no
  lanman auth = no
  
  ; force only Windows 7 and 8 and newer SAMBA compat
  server max protocol = SMB3
  server min protocol = SMB2

  ; reiterate defaults
  smb encrypt = auto
  server schannel = auto

  ; Force SAM auth (NO AD)
  auth methods = sam

#========== END -- FOR DEBUG - REMOVE IN PRODUCTION -- END =============

#============================ Share Definitions ==============================
[homes]
   comment = Home Directories
   browseable = no
   writable = yes

[USB]
  path = /media/USB
  read only = no
  valid users = jxpryde