I am looking for a 3 ft or 6ft USB-C to USB-C cable for a Mac mini (Intel)so I can transfer files to my iPad Pro from my computer. I have bought 3 from Amazon all with the same problem. When I plug them into the iPad Pro the iPad does not pop up on the Mac mini. The cable are connected as it is charging but I cannot see it in finder. If I plug a USB-A cable in it pops up fine. Anyone know a specific cable they have that will work that I can order from Amazon.