DJI SNAIL - Beeps- please help!

Hi guys,
im new to drone racing so plase, dont blame me if im stupid.
I connected my drone to my pc using betaflight, everything seems fine.
When I want to test the motors, I plugged the battery in (I have a 4S 95C LiPo 1300mah) and the drone started beeping and motors were doing nothing.
This was the firts start up. I dont know what to do with it, because I cant find anything on the internet.
Any suggestions ?

Sounds like you was calibrating the ESCs, was u?

Wat sort of beeps were they, was there a pattern?