Save or import from network drive

Is there a limit to the length of network path Synfig can import from or save to?
I seem to be able to work directly from a mapped network drive but when I try and work from a redirected windows home directory it fails.
I can browse but get the following error

Unable to import \\SERVERDC1\staffusers\bluey\My Documents\screenshots\2018-10-18\Screen 1\09-33-16-379.jpeg

Any ideas?