Hey Google Drive (like a cloud service) has language that says, they can do what they please with what you upload there. Disseminate it ways they see fit. If you delete they can can and do retain it.. Facebook came out with a similar statement a few years back, that things uploaded to them became their property..
Copyright can be discussed, determined, and bent in a court of law.. When George Harrison got sued for "My Sweet Lord", being stolen from 'He's So Fine' by the Chiffons, a 60's group.. It was an exercise for the lawyers.. Harrison did lose. I don't remember the fine, though..
Lennon got sued by lifting a few words from a Chuck Berry song.. Rather than pay a fine, he decided to record an album of his old favorite rock'n'roll tunes which were all owned by the same publisher.. Everybody one.. Lennon sold a LOT of albums, the Publishers made great money, and the listeners got to hear John Lennon interpretations of some of their favorite music.
I listen a lot when working on it.. Then usually don't.. Once in a while, I'll go thru some material, and cringe, 'oh did I do that?".. Other times, I'll find something years old. and not have thought a lot about it at the time.. and chuckle to myself that it was good.. Other times I listen to really old music I did.. And I can't remember doing it, how I did it.. and how I really might be hard pressed to recreate it.. (for me the technical aspects of kids, music software, virtual instruments governs that)..
To me, they are creations you generate.. Then you put it out in the world,, and it has some life, or gets forgotten.. Elton John once referred to his music as disposable like tissues, you use it, then toss it away, to be replaced by something new.
Paul McCartney was once asked about "Yesterday" (probably for the millionth time.. His response was 'Hey it's only a song"...