hello so i have a dji phantom an d a zenmuse gimbal and a video transmitter and reciever the transmitter now i plug it into the usb on the side of my gopro hero 3 but if i buy the hero 4 i readed i'll get problems with the video i saw video's on youtube and the conector fits the gopro hero 4 but does not work so can i use the usb port at the side of the gopro for my fpv my currant fpv with the hero 3 is also withe the usb port at the side

yes, you can.