Infuse on AppleTV dosn't fetch any metadata

Hello, it’s been a month that whenever I upload a movie or a serie on the NAS library, Infuse doesn’t recognise them correctly: metadata are not downloaded, even if the film itself is recognised: as a matter of fact, if I modify metadata manually, Infuse suggests the correct film title that corresponds to the file name. If I select it, the cover and metadata are correctly uploaded.
The same happens with iPad Infuse application, even if fewer times.
I had the bad idea to delete all Apple TV metadata (1 GB) and now all movies are not recognised.

In Infuse Settings “Download Metadata” is set to ON and “Use Local Metadata” is set to OFF

How can I solve this?

Thank you!