Photoshop video export missing codecs?

Hi, I'm trying to export an animation in photoshop and the only codecs it will let me export it as are h.264 and DPX. I need to export via quicktime because I need to export the animation with a transparent background. I'm on creative cloud and everything, including adobe media encoder is updated. All my computer software and drivers are updated as well. It doesn't matter if I go to file>export>render video or use the tiny arrow at the bottom of the timeline, it still doesn't work. Please help!!