adding videos smb location

hello, I have 2 nvidia shield tv devices and several fire tv sticks, all of them now are running kodi 17.3, I have use a seagate personal cloud NAS for more than a year without a problem, but since Kodi 17 arrived I am able to see the files I already shared with kodi, but I bought a new fire tv stick and I cant achieve to add any file on SMB format, I keep getting error2 share not possible or something like that. Is there any way to fix the issue?