What is the purpose of the SD card on an Asus ZenPad I had this issue on the Dell Venue but was never resolved. On an ASUS ZenPad, what is the purpose of the SD card if it can't be accessed? So how does one play movies from the SD card?
4.4 had a change that made all but one folder per app on the sdcard read only, but you could disable that... you should be using 7.1 anyway... why can't you access it? Did you format it as internal storage? If so you are using it, just transparently.

Is this the correct model? https://wiki.cyanogenmod.org/w/P024_Info