Tracks Greyed out! Cloud Sync I see them i can play them but nothing else

Tracks Greyed out! Cloud Sync I see them i can play them but nothing else - I cant upload to cloud i cant analyze and i cant export. All i can do is play them. HOW do you change the location when rekordbox thinks All files exist??  i have the original files i see quite a few people have had this and i need to know how to resolve.