Originally Posted by Aut0mat3d
I also struggled over that after rooting my device.
phps it is a bug in android 4.3.
I managed to copy stuff to internal storage with "ES Datei Explorer" - ES File Explorer - I hope it helps.
You my friend are correct, I ended up downloading other various similar apps and it seems that it was only Root Explorer that didn't work with the Find 7a. I have managed to copy over files to my system, but now I am faced with another problem. Which is enabling custom boot animation support..