»»Clementine expects Artist>album>file to be the structure of your library
I, too, have been having trouble with my library take-on. Most of my files have turned up in "Unknown". I took one of my artists, Glenn Miller, and created sub-directories, BLUEBIRD, DECCA, and so on, and moved the misic files accordingly, but they still turn up as Unknown, but they are listed under Title => filename, Album=>BLUEBIRD, and the Artist field is still blank.
I attach a screenshot showing my situation, and would appreciate any advice.