Also, I noticed if you long hold the directoty address when typing the directoy, a little browser pops up, allowing yoi to select files folders through it much easier. I only figured this out today lol.
Last but not least. Your cusrom directoy must not have any spaces, I find I receive a red icon then. E.g my folder "Android external data" had to be names "AndroidExternalData".
Sent from my GT-N7100