I seriously have respect for real and proper web developers!

“For every uploaded video, a thumbnail/snapshot image of the first frame is generated. The thumbnail image will be visible on Steemit and will link to your video on dMania. “

For the rest of the people I’ll explain how this is important.

Mobile devices are by default unable to play, load or auto play videos in browsers/apps and that generated thumbnail is setting your mobile device to make sure to load video as image and release it on your click (load).
If this wasn’t done properly we would not be having fun of doing videos here!

Great work and fun!

Upvoted!

Luci