Well it seems there's another problem with IML: I have an album that is DJ-mixed. When I enable iCloud Music Library, it seems to match track 1 instead of uploading it. The problem is it matches the Single version of the track, which means it doesn't flow properly into track 2 as it should on a DJ-mixed album. It seems to me the matching process must just look at the artist and track name. Why on Earth doesn't it include album name too, which would more or less eliminate mis-matches songs?