FF And RW + Transfer Help!

Hello I just purchased a live hub. I have two questions. #1. I just added an mkv to the built in hard drive. When I try to fast forward or rewind, it says this file does not support the trick function. What does that mean? When I play the same mkv thru my wd external hard dive the mkv fast forwards and rewinds with no problems. #2. If I purchase a Male to Male USB cable can I transfer my media from my PC to the hub? Do you have to transfer files thru the network only? Thanks in advance for all of your help!!!

technically its a network drive so you cant connect it directly

It may or may not work if connected threw the ethernet port let me know how that turns out