I guess your Macbook Air port is Type-C port, there are following ways for you: Way 1: need a USB A to USB C adapter. If your computer is type-c port, you need to have a USB A to USB C adapter, use the equipped usb cable, type-C end of USB cable to connect the camera, another end of USB Cable (usb-A) to connect the USB A to USB C adapter, and then insert into your computer, you will see a U disk icon on your computer, and then you can transfer the phones and videos on your computer. Way 2: Need a usb c sd card reader for Micro SD/SDXC/SDHC. We hope it is helpful to you. Thanks for your kind asking 

1.Please make sure the SD card is not damaged. If the SD card is corrupted, please switch to another SD card. 2.If the network quality is poor, the camera may not read the SD card. You can change the picture quality from HD to SD in the LIVE interface. 

The memory card supports MICRO SD (TF) card, CLASS 10, less than 32GB. The memory card size is 0.04 x 0.59 x 0.43 inches. Please format the memory card in the camera when using it for the first time. Do not insert or remove the SD card when the camera is turned on. We recommend using genuine brands. 

No, users need to purchase an SD card separately.(Supports up to 32G Micro SD） 

It takes the larger SD card