mobile

Coming from a long line of LG's, I do have to say I loved that LG's UI automatically recognized the USB and didnt need any apps to run it, and all other apps recognized it as well. So why doesnt the Nexus 6 do this? I am using stick mount but there are apps that dont recognize this, like with my G2 since it didnt have an SD card, so to save space i would setup titanium backup to store directly to the USB, but now it doesnt recognize it.
anyone have any ideas on how to work around this?