I have a Samsung Galaxy S6 Active. I also have an old(er) MAC running Sierra 10.12.3 Prior to upgrading the OS, I was able to synch my phone with my computer. However, since the upgrade I can't seem to do this. Seeing I'm an old codger and am all thumbs when it comes to tech shit, can someone recommend an app I can download to re-sync my gold? My music is getting tiresome and I need to update some stuff. Thank you