You can connect the USB cable to your computer, you will see the camera's files and then play the videos. If it doesn't solve your issue, pls contact us and attach some pictures, so that I can know detailed issues, thanks. These are the steps to contact us: Login your amazon account > choose Your orders > find the order ID > click Contact seller. 

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 

64G (only supports TF cards in FAT32 format of class 10 or higher) 

only Need to insert an SD card (maximum 256G, recommended 16GB~128GB) to use 

There is no memory card. Just save images or videos directly on your computer or phone.