My book 4tb router smart tv partial files

I have a mybook 4tb connected to a router to share all the files with the pc (Ok) the phones (ok) and the smart tv (a new LG - ko). First I formatted the drive from EXFAT to NTFS then I set the router parameter for the MEDIA SERVER (DLNA) to show all the media on the smart tv, but I can only see some of them. Do you know why? Please help!

probably need to check you router manual to find out what the largest capacity the router will recognise and also the router settings to refresh the media content of the dlna server