I used to use ES File Explorer to transfer media files or sideboard apps to my nexus Player, but it seems to not work anymore. I get a connection fail everytime whether I'm using my nexus phone or my Samsung tablet. I have a 128gb flash drive on the back of the nexus player which is formated to use only on the player. Which means if I unplug the USB drive (with otg) and directly plug it into my phone ES File Explorer can't read that formatted drive. Any other ideas on how to transfer files?
This has worked better for me than ES File Explorer:
X-plore File Manager
Also has DropBox, Google Drive and OneDrive support.