Why can't I download files in SBrowser when using an authenticated proxy?

Knox Workspace

When using an authenticated proxy, I am not able to download or open files using the Native samsung browser (Sbrowser).

SBrowser uses the Samsung download manager. For security reasons, SBrowser does not pass the authentication credentials to the download manager.
Use the table below to select a browser appropriate to your needs: 

Downloading external files   
Web Browser without Proxy with Proxy
S Browser yes no
Chrome yes yes
Firefox yes yes