I tried the most mainstream ones Detective Conan, dragon ball and naruto
Could you provide an example of how you have the files named for a few episodes of the series that are giving you problems?
Case Closed , also known as Detective Conan, is a Japanese detective manga series, Due to legal problems with the name Detective Conan , the English language releases from Funimation and Viz were renamed to Case Closed .
So my Detective conan are according to Seasons and case closed has a serial naming 1 - 998
If you name these files using this example it will pull all metadata and artwork flawlessly. I just tested it and all works well.
Case Closed S01E01.mkv
Case Closed S01E01 The Big Shrink.mkv
You can have the episode title if you want but it’s not necessary, it will be shown on the metadata in Infuse. You need to follow the SxxExx immediately after the series name for best results.
You can see the show info here.
With season 1 info here