Nexus Media Importer. It allows both import and export of files, video, audio, pictures, whatever.
Doesn't need to be rooted.
I've used it since it's inception. Works great.
I've used my USB OTG cable with a USB-to-Ethernet adapter to get a wired internet connection. Lollipop initially broke this functionality, but it works with 5.1.
I had watched someone's video on that before, I thought it was a great idea to plug straight in to Ethernet
Need to pick up one of thoes otg-Ethernet myself, or just make one