Defender for Android updates and sd card

Hello everybody,

I have a personal Microsoft 365 subscription and have Defender installed on my Android smartphone.
I wanted to ask you two things:
1) Are the signatures updated automatically? Is it possible to see the date of the last update to be sure that it updates regularly?
2) Also during installation it didn't ask me for permission to access my micro sd card.
Will it also check that with all its files?

Thank you all.