My computer is asking whether to set up my not so new iPhone as new, or to restore from a very old backup...
Several months ago, my iPhone had a problem and was replaced, and then backed up through iCloud. I have not synced it with my MacBook Air since then, but am now trying to do so. Since my iPhone has been replaced, many new purchases have been made on my iPhone, and I am now trying to sync any new music with my laptop. However, when I plug it into my Mac, the screen saying "welcome to your new iPhone" appears, giving me the option to either set it up as a new iPhone, or restore from a backup from several months ago.
How do I continue in order to sync my music from my iPhone with my MacBook, without losing anything that has since been purchased on my iPhone?
iPhone 5, iOS 8.4