Video answer: Thumbnails not showing previews when you roll over them in .
Top best answers to the question «Youtube why can i not see previews»
They're automatically turned on for eligible videos. They may not be added to all videos that are longer than 30 seconds. We use several criteria, including video topic and content, to figure out what videos can have previews. If you don't see a preview for a video within 2 days, the video isn't currently eligible.
Video answer: Can not see thumbnails/previews of image and video files .