Since the original series was around 1954 and the series you’re looking for started in 1984 you’ll have to modify the file names by adding the 1984 after the show name like “Sherlock.Holmes.1984.S01E01.MKV”
As remotevisitor said, on thetvdb their all together under Sherlock Holmes (1984) so you can go there and verify the episode names and numbers if their different that what you have as file names.
Well I have just made a lot of subfiles, where I entered each episode into or sometimes I just named them Episode01, 02, 03… and then finally found a JPG picture of the show and placed it together with the episodes.
But the way with Sherlock.Holmes.1984.S01.E01 - that works for me with both pictures and the plot for each episode!
You need to be a bit more specific, are all of your shows not finding metadata or only a few? How are the files of the ones that aren’t working named? Are you using DLNA by chance or smb or FTP?
Glad you’re on the right track! A side note, you can save yourself a little typing and skip the period between the “S01” and the “E01”. Infuse handles the “S01E01” group just fine. Sometimes extra dots or periods can cause a real hard to find problem with some names.