File type returning NULL - Did actually work but I don't know what I have done. Help!

Hey I wrote before but I don't see it, I'll say it again just incase there was some problem. 

I had the thing working, it was returning the string of the file, which I want to store in the database and then I can use this to reference the picture I want to use in the file. 

The whole thing was totally working now, its not. Totally head dead, after looking at it over and over again.

The $_File works but it doesn't return the string value, which I want to store in the database.