[Q] Can't find the ZIP in stock JB recovery (rooting guide) topic

I have a Galaxy Ace 2 (I8160XXMF2) and I'm following this guide here and I just want to root and install CM because stock JB is so slow.

Problem is after copying the file to the SD card (or even external SD card) the zip file cannot be found using the stock recovery. I can only find some empty folders in the stock recovery.

I hope you can help me out with this. Thanks!