Default Force 4G and Wi-Fi at the same time

I just got a new Olympus TG-3 camera that uses an app called image share. The camera broadcasts it's own Wi-Fi network and you connect the smartphone to control it and import pictures. However, there is obviously no internet through the camera. I was hoping there is a way to force Wi-Fi and 4G to run at the same time. Phone is a rooted LG L90 (D415). Sorry if it has been asked before, I've only seen threads asking about the opposite.