i have a extrnal hd to hub and it says its syncing and tarnfering?
It’s copying the USB drive to the Hub drive because you told it to do so.
The default setting when hooking up a USB device is to either CANCEL (at which point you can NOT view the files) or to COPY all the files (why couldn’t they just say “copy”?).
You can change the Settings so it doesn’t synch. There are a few settings to understand related to this including whether to view the hard drive AND the USB files or to only see one drive or the other at a time.
I have mine set to NOT copy by default so I can insert a USB thumb drive and play files without copying. I do think some of these settings are slightly confusing.