oh my zsh with git plugin, how to auto completion with filename

Question

my terminal picture

In that case,I want add 1.txt ,I must type ga tmp/caches/1.txt, how can i just type ga 1.txt and help me auto complete full file path. I've installed zsh-autosuggestions zsh-completions, but they were helpless.

I want some plugin can help me do that,but i don't know