When I transfer files from computer using USB (MTP), I can't access them on device Trying to set up my shiney new Nexus 7 (2013 edition) I used MTP to transfer files (music and ebooks) to the device from my Win7 PC. It seemed to work, but then when I ejected/disconnected the tablet, it registers that there is space being used in the folders, but doesn't show any of the files (when looking at Storage it says there's 600MB worth of stuff in the folder, but when I tab on it there's no files listed, and my music player and e-reader apps don't see anything either). 

What gives?

Thanks in advance for your help!
At Izzy's suggestion, I installed a file manager (OI), and was able to see the files that my Android itself didn't recognize. I used OI to cut-paste them to a new dummy directory and then back to where they belonged, Android recognized them and I can use with the relevant apps (Kindle, Kingsoft Office).