How do you transfer files from ‘local disk (c: ) to ‘Storage (d: )’ on a laptop ?

My local disk only has 525mb out of 34.2gb , but I haven’t downloaded any programs , the only thing that’s really on it is music and my work , but my storage still has 114gb left , so is it possible to move some stuff into there? , (if so how ?)

thankyou :)
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