How do you download music to a Telstra Signature Premium phone (HTC One A9)

A

AC Question

Hi - we recently upgraded phones and are trying to download music files. They are currently on a computer and we have tried to drag the files over to the phone with no luck. Any tips or tricks on the proper way to do this? We have tried Windows Media Player and the HTC Sync Manager with very little luck - succeeded in getting a handful of songs copied but not sure how we did it! We're newbies...

Thanks in advance!