If I have a previous backup with new data, but not all the songs i want on an old computer, how do i authorize and sync the new computer?

[JoshuaCaleb]

I realized a while ago that I must have removed some songs from my previous iphone. Someone gave me a different iphone so i could update an app on a different iOS. I had backed up my previous iPhone prior. Then what happened was my old laptop started having problems, and i found that the recent iphone has a lot of songs missing that I have on the old system. Many songs are not on the cloud as they were purchased from other sources. These songs were backed up to an external hard drive and put onto the other system.I have seen that there are some articles that seem to list intructions to an exte

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