There are several ways of doing it but we provide instructions how to transfer video and photos from the Pis to the ground station laptop using a program called WinSCP in both the RFD and Ubiquity documentation. WinSCP should be installed on all the laptops. Double check the instructions to see which IP addresses are being used, but when you are connected to the pi over Ubiquity you open Winscp and there is a box to enter the IP address of the pi, the user name: pi, and the password: raspberry. It then opens a window divided in half with one half showing the files on the laptop and the other half showing the files on the pi. Then you just drag and drop the files/folders you want to copy from one to the other. In VLC there is a way to record the video the laptop while it is streaming but this may change if we are not using VLC anymore. With the RFD you connect to the pi over the ad-hoc and follow the same steps but the IP address of the pi will be different depending if you are on the video payload or the RFD payload. This method lets you transfer files in the field without additional hardware or being connected to a network. If you are in a lab and have the pi connected to a monitor and keyboard you can put a usb flash drive in the pi and copy the video or photos to the flash drive. If you are connected to a network you can use a program on the pi called scp to copy the files to anywhere on the same network but this would require knowing how to change the network settings on the pi to connect to the network you are trying to use so copying to the ground station or to a flash drive is the easiest. I can make a video on this too.
If anyone is curious why you can’t just put the card in a computer and copy the files: The SD card on the pi is essentially the Pi’s hard drive, it is set up and partitioned just like any hard drive in a Linux desktop computer. If you were to put the SD card in a Windows PC it would be like taking a hard drive out of a Linux computer and trying to run it in a Windows computer. You could take the SD card and put it in a Linux computer and copy files but you have to know how the Linux OS tree is structured in order to find anything, it would not just be a list of files with human readable names until you got deep enough into the file structure. With digital cameras and other things that use SD cards they are using the SD card as additional storage similar to plugging a flash drive into a computer. The OS and other software that runs the camera, phone, etc is stored in somewhere else(EEPROM memory on another chip), where as the Pi the only storage is the SD card which is where the OS is stored, so it is structured like a computer’s hard drive and not like a flash drive.