My husband got his Nexus 5 Christmas gift from me early; cannot get Google Drive to sync between the Nexus and our desktop PC. Files uploaded on either not visible to each other. Tried to download and install the supposed Drive sync app for PC and this did nothing. My Nexus 4 syncs fine. Same Gmail ID on both. I'm wondering if there's some setting preventing syncing on Nexus 5 from happening unless connected to Wifi, as that seemed to crop up on something else yesterday. Cannot find such a setting on the Nexus 5 though.