[scribus] Accessing files across a network

[Ken Springer]

Scribus 1.5.2

I have a variety of computers on my network.  With some of the 
computers, I'm working on different aspects of a project.

But, I want to store all files created for this project on a single 
computer's hard drive.  We'll call that computer, Computer A.

I have Scribus installed on Computer B.

When I start Scribus, I want to open a file that is located on Computer 
A.  But I see no way to access Computer A from the Open dialogue box.

Am I missing something obvious?

If it's not possible in 1.5.2, is it possible in 1.5.3?

-- 
Ken
Mac OS X 10.11.6
Firefox 53.0.2  (64 bit)
Thunderbird 52.0
"My brain is like lightning, a quick flash
      and it's gone!"