Hi Eddie, the 100x zoom is limited to photos and not videos, and will not work on the 200 and 50 megapixels modes. You need to change the resolution first and you'll be able to zoom in. The zoom will also vary between modes in video, for example at FHD 30 you can reach 20x but when u change to UHD or different fps, that will also prevent you from zooming in more. Hope this is helpful and let me know if it works now.
