I am at a loss as to where to post this question/email.
There is a (growing?) inconsistency between application using open file/folder dialog to access "networked" locations, e.g. smb/sftp.
Firefox ESR 60/Atom editor being the latest in my experience.
Is this a redhat/centos issue? a gnome issue? or up to each individual application?
Screenshot examples: https://github.com/atom/atom/issues/8729#issuecomment-405377120
Other applications (such as Libreoffice/Evolution) provide any/all available network locations when opening/attaching files.