Ecco la risposta del supporto tecnico:
Quindi, la nuova Beta dovrebbe fixare questo errore, e verrà poi introdotto nella 4.1 definitiva!Thanks for your co-operation. R&D engineer has found the root reason:
some photo contain more information in EXIF
or IPTC and it could cause media library database
crashed (this is a known issue). Now R&D team
has claimed it would been fixed in newer beta (QTS
4.1.0 beta) and when official QTS 4.1.0 released
you could launch media library scanning for all photo.
And you could access them in other media applications
too.
Finalmente!!
Grazie QNAP!
Volevo condividerlo con voi nel caso qualcuno si trovi nella mia stessa situazione