Transmission stopped working while driving

I was driving down road and transmission just stopped working. I pull off road let cool down then added fluid started truck and truck would not budge. It's like the shifter doesn't engage. I even tried in 4wd still nothing.
transmission has been leaking for a while only had problems when fluid was low. Then I was manually shifting for a few trips total miles of manually shifting was about 25 miles. Then now this.
I will send pic of where the trans fluid is leaking.