Door Entry Where should I install an SD card for video replay?

[Clarise]

I have a hik-vision app for my flat and a tablet on the wall in my flat. When someone’s buzzed out flat I get a call on my phone and I can let them in or speak to them etc. but I can’t see the playback as no SD card, where would I put this SD card is it’s a shared camera with the rest of the block?