Enable file location selection when downloading in the Glip section of the RC App

When using the new RingCentral app (not Classic) the user doesn't have a choice of where files received in Glip messaging will download to. They automatically download to the default download folder for the PC. However, when using the RingCentral web login the user DOES have the choice to select the download location as long as the browser settings are adjusted accordingly. When the user is working on a hybrid system (all server files are kept in cloud storage, but some apps, including RingCentral, are resident on PC), files cannot be saved to a cloud location unless the user is logged into RingCentral on the appropriate browser. This file download choice function should be consistent across all RingCentral platforms.