The Yuneec CGO-ET manual's good for describing the camera and its thermal palettes, but it doesn't discuss how to get the thermal imagery split out from the low-light visible.
Both images are recorded in the same multi-track video file. I think it might be easier for Mac users with a video editor that can handle multi-track gracefully, but it's a tortured work flow for a PC.
VLCPlayer and MKVToolnix can separate the images for you into MKV, MKVToolnix can set them to MP4, then you can overlay the thermal on top of the low-light with a video editor like Camtasia.