Example of work flow,
Plug big heavy camera into the laptop.
Drag files across and then send to a wifi drive.
IOS cannot do this unless you wish to tie IOS up in knots.
Laptop job done however 1 gig still requires 5/6 mins to transfer over local area network.
Now on the wifi hard drive I can access the files.
Use file browser as it gives a image preview of RAF files.
Bring this into IOS and edit.
Advantages if you screw up your files on the iOS, you still have the original on the wifi hard drive.
This method fails in movie files as the transfer of gigs is like a the narrow boat being pulled by horses.
Image editing fine and I actually prefer now to edit my images on an tablet environment.
Edited this file in local pub sitting by the fire using their wifi accessing my files at home.