Common issue(s) are rights and permissions. Samba is using strange approach, so i have to add this to my config (and i use group permissions/ownership to access the files)
force user=mysambauser
force directory mode = 0775
force create mode = 0664
also “security option” (share,user,domain) might cause several troubles (i usually do not recommend domain and share with enabled guest)
some time ago i prepared this (only in CZ) Maxovy poznamky k smb.conf