Artist names not showing next to albums names in Sony Music app

[AC Question]

Have downloaded some albums from iTunes using Sony Bridge for Mac software on to Sony Xperia Z5 compact on to SD memory card. Some albums have downloaded and are displaying album name, artist name, artwork etc okay in the Sony Music app. However a number have downloaded as the correct album name but showing as 'unknown artist'. Checking on File Commander app the albums are showing all the correct info - album name, album artist etc. How do I update the artist name in the Sony Music app as not obvious.