Unreal File Manager Limited

I was going to import textures into UE 4.10, however, i was quite frustrated when I hit import and it seemed that I couldn’t find my .png files. I looked into it, and there is a file manager at the bottom, but no .png option. After doing some stuff, only 2 options were available, Unreal Test Files, and All Files. So naturally, I selected ‘All Files’, yet I can’t find any png files.

‘unreal text files’*