UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10895.78.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.120 Safari/537.36

Steps to reproduce the problem:
1. Using "Settings|Downloads|Network File Shares" add a SMB Network File Share (e.g. a shared folder on a Windows machine or Samba based NAS).

2. Right click on any image on a web page and select "Save image as..."

OR

Find any attachment in a Gmail email and select "Download".

3. The "Save File As" dialog box opens. 
4. The only options listed are "My Files" and "Drive". Any SMB network shares that normally appear in the "Files App" after being successfully added are not present.

What is the expected behavior?
SMB shares Added via "Settings|Downloads|Network File Shares" should appear as an option in Chrome's "Save File As" dialog box. A user should be able to save a file directly to a network share rather than having to first download the file locally and then move it via the "Files App".

What went wrong?
SMB network shares added via "Settings|Downloads|Network File Shares"are not listed as an option in Chrome's "Save File As" dialog box.

Did this work before? N/A 

Chrome version: 69.0.3497.120  Channel: stable
OS Version: 10895.78.0
Flash Version: 

Oddly enough the reverse of this does work as expected. If a user tries to "upload" a file to a server using the "Select A File" dialog box (which appears to be identical to the "Save File As" dialog) everything works.

For example a user can add an attachment to a new Gmail email message from a network share. Users cannot however download any files directly to a network share.