And what is actually the 256Gb or the 512 Gb storage space? 🤔I am now confused.

I have a 512GB in it and it is also supported.
Samsung PRO Plus
microSDXC, 512 GB, U3, UHS-I

I have a 64gb card in it. Storage time per cam with me -3 days... still have about 15gb free... with 4 cam

The maximum supported size for the microSD card is 256GB

Hi, I'm sorry I can't help you, I haven't tried inserting a memory card yet to find out the total capacity.

up to max. 256 GBmicro SD card. Lasts a very long time. When full, the oldest ones are automatically overwritten

254Gb according to description