I'm trying to get a picture to fade on at 5 seconds into the animation. The first keyframe in the transition has the visibility set to 0%, then after 10 frames the next keyframe is set to 100%. This all works fine when playing it back in the timeline. However, when I view it in a browser (either using the File Preview or exporting it then opening the html file), the image is fully visible all the way through the animation, and it actually blinks at the 5 second mark. How do I keep it from showing all of the time?