So I got my base model MBP 2019 and chose to buy an external HDD to have more space. I tested the HDD on my windows computer and it is working fine. The HDD is with USB 3.1. I also bought a USB-C Hub but I kind of cheeped out on it. It does say it's usb-c to usb 3.1 however. Now the problem is whenever I try to copy any files on the HDD from Mac it takes way too long. For example for 11 GB it says around 2 hours when on my PC it did 16 GB in literally a few minutes. The HDD is formatted to exFAT (thought I tried it with all possible formats). Also there is no problem copying files FROM the HDD to the Mac just from Mac to HDD. Side note: uTorrent also doesn't let me download directly onto the HDD by saying it doesn't have enough permissions to right on it.