Git diff does not pick new files

[IT CTO]

Based on flume docs I tried using git diff to create the patch I want to
submit. But I noticed the file only contains the updated files and no new
files were added.
Why?
Also, if I use the --staged flag only new file are included.
What am I missing?
Eran
-- 
Eran | "You don't need eyes to see, you need vision" (Faithless)