You should hold the element and start moving it to the new destination. Then a little menu pops up on the footer with "move" "copy" at left corner from below.
touch copy and end the movement into new destination.
Hi @josh, I suspect you are using an older version of IOS. I added this functionality along with drag and drop for IOS 11+.
You can still copy though. Just swipe down on the loop to bring up the options menu where you will see FX, Mix and Label icons. Then swipe right to bring up the next set of options where you will find copy.