Browse into sandisk drive while connected by router to Internet

New with this device I get into drive using different protocol by direct wifi connect

Webdav works well in different platforms: Cyberduck in mac, third party apps in iPad (infuse, pdf expert)

however I can’t do it when device is connected throw home router that connect to Internet at same time

I setup connection with native sandisk app and then connect the iPad to my home wifi adsl connection And I drive into sandisk flash folders using native app but it impossible use third parties apps (Cyberduck, Infuse, pdf expert) that are not able to get connection as before

appreciate any contribution, thanks

try to restart….!!!