Greg wants to access his music from Amazon with his Echo. Leo says the Echo does support Amazon Prime Music, but that's a limited subset. His sense is that it wont, but it says that it will support Amazon music. He would have to upload his music to his Amazon Music library and then he'll need to have the right syntax to ask to play it. "Hey Echo, Play [Name of the Song]" and it should just play it. If he has them organized in folders, it could be problematic.
Greg should check out LoveMyEcho.com for tips.